ci(github-actions): use 3.13 instead of 3.13-dev as Python 3.13 has already been released

[Lee-W]

Description

as title

Checklist

• Add test cases to all the changes you introduce
• Run ./scripts/format and ./scripts/test locally to ensure this change passes linter check and test
• Test the changes on the local machine manually
• Update the documentation for the changes

Expected behavior

CI should just pass

Steps to Test This Pull Request

Additional context

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.58%. Comparing base (120d514) to head (774c5ec).
Report is 482 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1285      +/-   ##
==========================================
+ Coverage   97.33%   97.58%   +0.24%     
==========================================
  Files          42       55      +13     
  Lines        2104     2605     +501     
==========================================
+ Hits         2048     2542     +494     
- Misses         56       63       +7     

Flag	Coverage Δ
unittests	97.58% <ø> (+0.24%)	⬆️

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