1.5.0 / Support Python 3.15

Release 1.5.0
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* Bump GitHub Actions dependencies. By @junkmd.
* Refactor enum member iteration in code generator namespaces. By @junkmd.
* Expose inline typing metadata to type checkers. By @Robolightning.
* Modernize ``test_pip_install.py`` and include in ``autofmt`` workflow. By @junkmd.
* Introduce CI type-checking harness. By @junkmd.
* Add documentations for developers on how this package supports static typing. By @junkmd.
* Resolve internal CPython ABI/struct layout incompatibilities. By @junkmd.
* Update the code generator to handle Python 3.15's changes to ``enum.IntFlag``. By @junkmd.
* Do something. By @who.