Update nanobind requirement from <2.5.0 to <2.6.0

[dependabot]

Updates the requirements on nanobind to permit the latest version.

Changelog

Sourced from nanobind's changelog.

Version 2.5.0 (Feb 2, 2025)

• Added :cpp:class:nb::def_visitor\<..\> <def_visitor>, which can be used to define your own binding logic that operates on a :cpp:class:nb::class_\<..\> <class_> when an instance of the visitor object is passed to :cpp:func:class_::def(). This generalizes the mechanism used by :cpp:class:init, :cpp:class:new_, etc, so that you can create binding abstractions that "feel like" the built-in ones. (PR [#884](https://github.com/wjakob/nanobind/issues/884) <https://github.com/wjakob/nanobind/pull/884>__)

• Added some special forms for :cpp:class:nb::typed\<T, Ts...\> <typed> (PR [#835](https://github.com/wjakob/nanobind/issues/835) <https://github.com/wjakob/nanobind/pull/835>__):

  • nb::typed<nb::object, T> or nb::typed<nb::handle, T> produces a parameter or return value that will be described like T in function signatures but accepts any Python object at runtime.

  • nb::typed<nb::callable, R(Args...)> produces a Python callable signature Callable[[Args...], R]; similarly, nb::typed<nb::callable, R(...)> (with a literal ellipsis) produces the Python Callable[..., R].

• It is now possible to create Python subclasses of C++ classes that define their constructor bindings using :cpp:struct:nb::new_() <new_>. Previously, attempting to instantiate such a Python subclass would instead produce an instance of the base C++ type. Note that it is still not possible to override virtual methods in such a Python subclass, because the object returned by the :cpp:struct:new_() <new_> constructor will generally not be an instance of the alias/trampoline type. (PR [#859](https://github.com/wjakob/nanobind/issues/859) <https://github.com/wjakob/nanobind/pull/859>__)

• Fixed the :cpp:class:nb::int_ <int_> constructor so that it casts to an integer when invoked with a floating point argument.

• Multi-level inheritance (e.g., A → B → C) previously did not work on Python 3.12+ when a base class (e.g., A) provided a trampoline implementation. This is now fixed. (commit 92d9cb <https://github.com/wjakob/nanobind/commit/92d9cb3d62b743a9eca2d9d9d8e5fb14a1e00a2a>__).

• A new NB_SUPPRESS_WARNINGS parameter of :cmake:command:nanobind_add_module that marks the nanobind and Python include directories as SYSTEM <https://cmake.org/cmake/help/latest/command/include_directories.html>__ include directories, which suppresses any potential warning messages originating there. This is mainly of relevance for projects that artificially raise the warning level using flags like -pedantic, -Wcast-qual, -Wsign-conversion. (PR [#868](https://github.com/wjakob/nanobind/issues/868) <https://github.com/wjakob/nanobind/pull/868>__).

• Fixed (benign) reference leaks that could occur when std::shared_ptr<T>

... (truncated)

Commits

• 4ccbe6e v2.5.0 release
• 30f4200 preparations for the next release
• 90ef5bc Improve type_caster for complex number types. (#854)
• 6fbc99a changelog updates
• 0c80eec Introducing option NB_SUPPRESS_WARNINGS to nanobind_add_module (#868)
• 185afbc stubgen: Fix generated stub filename when referencing out-of-directory extens...
• 3dfbdb1 Don't print too many "leaked instance" messages. (#883)
• d793091 Fix race condition in free-threaded Python (fixes issue #867) (#887)
• 89c40e1 Introduce def_visitor abstraction for objects that provide custom binding log...
• 534fd8c Better handling for Python subclasses of types that use nb::new_() (#859)
• Additional commits viewable in compare view

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