feat: Drop support for Python 3.9 as EOL reached and add Python 3.14 support

[Lee-W]

Description

Python 3.9 has become upsoorpted version by Oct 31th
https://devguide.python.org/versions/#unsupported-versions

Checklist

• I have read the contributing guidelines

Code Changes

• [ ] Add test cases to all the changes you introduce
• Run poetry all locally to ensure this change passes linter check and tests
• Manually test the changes:
  • Verify the feature/bug fix works as expected in real-world scenarios
  • Test edge cases and error conditions
  • Ensure backward compatibility is maintained
  • Document any manual testing steps performed
• Update the documentation for the changes

Documentation Changes

• Run poetry doc locally to ensure the documentation pages renders correctly
• Check and fix any broken links (internal or external) in the documentation

When running poetry doc, any broken internal documentation links will be reported in the console output like this:

INFO    -  Doc file 'config.md' contains a link 'commands/bump.md#-post_bump_hooks', but the doc 'commands/bump.md' does not contain an anchor '#-post_bump_hooks'.

Expected Behavior

Steps to Test This Pull Request

Additional Context

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v4-11-0@5972ea3). Learn more about missing BASE report.

Additional details and impacted files

@@            Coverage Diff             @@
##             v4-11-0    #1648   +/-   ##
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  Coverage           ?   98.67%           
==========================================
  Files              ?       60           
  Lines              ?     2646           
  Branches           ?        0           
==========================================
  Hits               ?     2611           
  Misses             ?       35           
  Partials           ?        0           

Flag	Coverage Δ
unittests	98.67% <100.00%> (?)

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[bearomorphism]

I think we can merge this first so we can cleanly merge other PRs.

[Lee-W]

I think we can merge this first so we can cleanly merge other PRs.

Yep, sounds like a good idea. @woile could you please take a quick look when you have some bandwidth? Thanks!