add python 3.14 support

[oliverlambson]

Description

Add python 3.14 support. (I did not add 3.14t in case that needs additional testing)

Motivation and Context

How has this been tested?

Added it to all the test matrices and ran tox locally (passed everything except SSL tests, but did that in all envs so assume it was an unrelated localhost thing -- will be sure once CI runs)

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[chandr-andr]

@oliverlambson Thanks for the PR. Will merge it as soon as the tests pass