Bumps python from 3.13.4-alpine to 3.13.5-alpine.

---
updated-dependencies:
- dependency-name: python
  dependency-version: 3.13.5-alpine
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Read the Docs builds began permanently failing on February 26, 2024.

The differential diagnosis between success and failure
seems to be that the last successful build used Poetry 1.7.1;
the first failing build used Poetry 1.8.1.
For reference, Poetry 1.8.1 was released on February 26, 2024.

Read the Docs later updated its "Install dependencies with Poetry"
documentation to note that Poetry needs a `$VIRTUAL_ENV`
environment variable set.

https://docs.readthedocs.com/platform/stable/build-customization.html#install-dependencies-with-poetry

This change aligns the Read the Docs config with the documented
fix, and simultaneously updates the build OS and Python version,
which are both very old.

These changes now allow the `poetry check` command
to run successfully and without warnings.

As a part of this change, the `docs` extra was removed
in favor of the Poetry `docs` dependency group.

The built sdist was checked and confirmed to still have
the `tests/` directory, as well as the `py.typed` file.
The built wheel was checked and confirmed to still have
the `py.typed` file.

Dependabot doesn't appear to be submitting PRs to maintain these.
However, the Dependabot config appears to be valid.
There may be a setting that needs to be adjusted at the org level
or at the individual repository level.

This change eliminates warnings in CI caused by the deprecation.

In addition, using the `python-version` output of the
`setup-python` action fixes a bug that prevented Windows caches
from containing the Python version.

For reference, Windows caches were created with names
that lacked the Python version, like:

```
venv-pull_request-Windows--{hash}
```

Found and fixed by running `typos` against the codebase.

This change makes it easier for people to contribute
to the project when opening a PR.

Currently, GitHub shows links to `CONTRIBUTING.rst`
when opening a PR, but when people click on those links
they are simply told "Go to a third-party website
to view the contributing guidelines".

This change replaces the manual redirect with actual content
so that no third-party website (in this case, Read the Docs)
is necessary to understand the contributing guidelines.

In addition, `docs/contributing.rst` now uses a directive
to `include` the contents of `CONTRIBUTING.rst`.
This was tested by building the documentation locally
and confirming that the HTML documentation still contained
the contributing guidelines.

The result is a streamlined contributing experience from within
GitHub, no duplicated content, and no changes to the
built documentation.

Migrate to PEP 621 project metadata

…3.13.5-alpine

Bump python from 3.13.4-alpine to 3.13.5-alpine

…cess

Move the `docs/contributing.rst` contents to `CONTRIBUTING.rst`

Remove `MANIFEST.in`, which is unused by Poetry

Fix several typos

Fix CI warnings and update GitHub action versions

Fix Read the Docs builds

…g-name

Remove `hooks.yaml`, which is unused by pre-commit