Update python to 3.13 and update dependencies

[mkrnr]

Summary of changes

Updates the python version that is packaged into the Plover installers to 3.13 and updates all python dependencies to the latest supported versions.

Noteworthy changes:

• New python version enables universal macOS installer, closes Apple Silicon Support #1361
• Using memory cache instead of sqlite for requests_cache due to Fix SQLite concurrency on python 3.12 requests-cache/requests-cache#845 and to simplify setup
• Retrieve pip via get-pip.py since running the pip wheel is not supported anymore, see CommandError: To modify pip, please run the following command pypa/pip#11431
• Remove support for Python 3.8 and 3.9 since in 3.9, importlib.metadata.entry_points does not allow filtering by group.
• Replaces deprecated pkg_resources, closes pkg_resources is deprecated as an API #1703

Tests

• macOS: arm64 (M1 macOS 15.5)
• macOS: x86_64 (macOS 14.2.1)
• linux: x86_64 (Ubuntu)
• Windows: x86_64 (Windows 11)

Pull Request Checklist

• Changes have tests
• News fragment added in news.d. See documentation for details
• cache_epoch in CI/CD reverted

[greenwyrt]

Could we resolve #1714 with the version/dependency update?

[mkrnr]

As @dylanwulf wrote in #1714, the pkginfo version is already updated on main. So I'd say we can close #1714 and should soon release the first dev version of v5.0.0. My goal is to do that after merging this PR.