tokio-imap: bump MSRV (for cc)

Author: djc

.github/workflows/main.yml

@@ -52,7 +52,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.63.0
+          toolchain: 1.67.0
       - run: cargo check --manifest-path tokio-imap/Cargo.toml --lib --all-features
 
   coverage:

tokio-imap/Cargo.toml

@@ -2,7 +2,7 @@
 name = "tokio-imap"
 version = "0.5.0"
 edition = "2021"
-rust-version = "1.63"
+rust-version = "1.67"
 description = "Tokio-based IMAP protocol (client, for now) implementation"
 documentation = "https://docs.rs/tokio-imap"
 keywords = ["imap", "tokio"]