Auto merge of #13857 - rust-lang:renovate/msrv, r=epage

chore(deps): update msrv (3 versions) to v1.76

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This PR contains the following updates:

| Package | Update | Change | Pending |
|---|---|---|---|
| [MSRV:3](https://togithub.com/rust-lang/rust) | minor | `1.75` -> `1.76` | `1.78` (+1) |

---

### Release Notes

<details>
<summary>rust-lang/rust (MSRV:3)</summary>

### [`v1.76`](https://togithub.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1760-2024-02-08)

[Compare Source](https://togithub.com/rust-lang/rust/compare/1.75.0...1.76.0)

\==========================

<a id="1.76.0-Language"></a>

## Language

-   [Document Rust ABI compatibility between various types](https://togithub.com/rust-lang/rust/pull/115476/)
-   [Also: guarantee that char and u32 are ABI-compatible](https://togithub.com/rust-lang/rust/pull/118032/)
-   [Add lint `ambiguous_wide_pointer_comparisons` that supersedes `clippy::vtable_address_comparisons`](https://togithub.com/rust-lang/rust/pull/117758)

<a id="1.76.0-Compiler"></a>

## Compiler

-   [Lint pinned `#[must_use]` pointers (in particular, `Box<T>` where `T` is `#[must_use]`) in `unused_must_use`.](https://togithub.com/rust-lang/rust/pull/118054/)
-   [Soundness fix: fix computing the offset of an unsized field in a packed struct](https://togithub.com/rust-lang/rust/pull/118540/)
-   [Soundness fix: fix dynamic size/align computation logic for packed types with dyn Trait tail](https://togithub.com/rust-lang/rust/pull/118538/)
-   [Add `$message_type` field to distinguish json diagnostic outputs](https://togithub.com/rust-lang/rust/pull/115691/)
-   [Enable Rust to use the EHCont security feature of Windows](https://togithub.com/rust-lang/rust/pull/118013/)
-   [Add tier 3 {x86\_64,i686}-win7-windows-msvc targets](https://togithub.com/rust-lang/rust/pull/118150/)
-   [Add tier 3 aarch64-apple-watchos target](https://togithub.com/rust-lang/rust/pull/119074/)
-   [Add tier 3 arm64e-apple-ios & arm64e-apple-darwin targets](https://togithub.com/rust-lang/rust/pull/115526/)

Refer to Rust's \[platform support page]\[platform-support-doc]
for more information on Rust's tiered platform support.

<a id="1.76.0-Libraries"></a>

## Libraries

-   [Add a column number to `dbg!()`](https://togithub.com/rust-lang/rust/pull/114962/)
-   [Add `std::hash::{DefaultHasher, RandomState}` exports](https://togithub.com/rust-lang/rust/pull/115694/)
-   [Fix rounding issue with exponents in fmt](https://togithub.com/rust-lang/rust/pull/116301/)
-   [Add T: ?Sized to `RwLockReadGuard` and `RwLockWriteGuard`'s Debug impls.](https://togithub.com/rust-lang/rust/pull/117138/)
-   [Windows: Allow `File::create` to work on hidden files](https://togithub.com/rust-lang/rust/pull/116438/)

<a id="1.76.0-Stabilized-APIs"></a>

## Stabilized APIs

-   [`Arc::unwrap_or_clone`](https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.unwrap_or_clone)
-   [`Rc::unwrap_or_clone`](https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.unwrap_or_clone)
-   [`Result::inspect`](https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.inspect)
-   [`Result::inspect_err`](https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.inspect_err)
-   [`Option::inspect`](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.inspect)
-   [`type_name_of_val`](https://doc.rust-lang.org/stable/std/any/fn.type_name_of_val.html)
-   [`std::hash::{DefaultHasher, RandomState}`](https://doc.rust-lang.org/stable/std/hash/index.html#structs)
    These were previously available only through `std::collections::hash_map`.
-   [`ptr::{from_ref, from_mut}`](https://doc.rust-lang.org/stable/std/ptr/fn.from_ref.html)
-   [`ptr::addr_eq`](https://doc.rust-lang.org/stable/std/ptr/fn.addr_eq.html)

<a id="1.76.0-Cargo"></a>

## Cargo

See [Cargo release notes](https://togithub.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-176-2024-02-08).

<a id="1.76.0-Rustdoc"></a>

## Rustdoc

-   [Don't merge cfg and doc(cfg) attributes for re-exports](https://togithub.com/rust-lang/rust/pull/113091/)
-   [rustdoc: allow resizing the sidebar / hiding the top bar](https://togithub.com/rust-lang/rust/pull/115660/)
-   [rustdoc-search: add support for traits and associated types](https://togithub.com/rust-lang/rust/pull/116085/)
-   [rustdoc: Add highlighting for comments in items declaration](https://togithub.com/rust-lang/rust/pull/117869/)

<a id="1.76.0-Compatibility-Notes"></a>

## Compatibility Notes

-   [Add allow-by-default lint for unit bindings](https://togithub.com/rust-lang/rust/pull/112380/)
    This is expected to be upgraded to a warning by default in a future Rust
    release. Some macros emit bindings with type `()` with user-provided spans,
    which means that this lint will warn for user code.
-   [Remove x86\_64-sun-solaris target.](https://togithub.com/rust-lang/rust/pull/118091/)
-   [Remove asmjs-unknown-emscripten target](https://togithub.com/rust-lang/rust/pull/117338/)
-   [Report errors in jobserver inherited through environment variables](https://togithub.com/rust-lang/rust/pull/113730/)
    This [may warn](https://togithub.com/rust-lang/rust/issues/120515) on benign problems too.
-   [Update the minimum external LLVM to 16.](https://togithub.com/rust-lang/rust/pull/117947/)
-   [Improve `print_tts`](https://togithub.com/rust-lang/rust/pull/114571/)
    This change can break some naive manual parsing of token trees in proc macro
    code which expect a particular structure after `.to_string()`, rather than just arbitrary Rust code.
-   [Make `IMPLIED_BOUNDS_ENTAILMENT` into a hard error from a lint](https://togithub.com/rust-lang/rust/pull/117984/)
-   [Vec's allocation behavior was changed when collecting some iterators](https://togithub.com/rust-lang/rust/pull/110353)
    Allocation behavior is currently not specified, nevertheless changes can be surprising.
    See [`impl FromIterator for Vec`](https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#impl-FromIterator%3CT%3E-for-Vec%3CT%3E)
    for more details.
-   [Properly reject `default` on free const items](https://togithub.com/rust-lang/rust/pull/117818/)

</details>

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Author: bors

Cargo.toml

@@ -11,7 +11,7 @@ exclude = [
 ]
 
 [workspace.package]
-rust-version = "1.75"  # MSRV:3
+rust-version = "1.76"  # MSRV:3
 edition = "2021"
 license = "MIT OR Apache-2.0"
 homepage = "https://github.com/rust-lang/cargo"