Fix up classifier from typo

Signed-off-by: Jordan Borean <jborean93@gmail.com>

Fix up flake issue

Signed-off-by: Jordan Borean <jborean93@gmail.com>

Fix license file release

Signed-off-by: Jordan Borean <jborean93@gmail.com>

Update Python requirements and pin Cython

Updates the build dpendencies to newer versions, sets the new minimum
Python requirement to 3.9 and adds official support for Python 3.14.
Also pins the build requirements to a specific Cython version to support
deterministic builds.

Signed-off-by: Jordan Borean <jborean93@gmail.com>

Bump Python 3.13 test version

Signed-off-by: Jordan Borean <jborean93@gmail.com>

The syntax was incorrect so use just write

Signed-off-by: Jordan Borean <jborean93@gmail.com>

Use just major version

Signed-off-by: Jordan Borean <jborean93@gmail.com>

Bump version to 1.8.1 with Python 3.7 requires

This update bumps the `python_requires` to be `>=3.7` as the sdist build
requires PEP 517 support that is somewhat only guaranteed with the pip
that was shipped with Python 3.7 or greater. Since 3.6 has been end of
life since December 2021 and the remaining Linux distributions that
still use it have system provided packages this shouldn't be a surprise.

Also use CentOS 9 Stream in the CI tests to test this on an actual
RHEL-ish host on the version of Python actually supported.

Signed-off-by: Jordan Borean <jborean93@gmail.com>

Fix up build problems with latest change

Signed-off-by: Jordan Borean <jborean93@gmail.com>

More fixes for the release process

Signed-off-by: Jordan Borean <jborean93@gmail.com>