fix: update github CI python version to 3.14

[adsuna]

Update python version to 3.14 to fix failing github action

[Thilak-KN]

@adsuna , could I know why you are proposing to bump the Python 3.14 version? because I believe some portions (certain module) of current code[^1] does not run on Python 3.14

[^1] #691

[adsuna]

The change is only for the github CI and the current tests being run in the CI work on Python 3.14, since it only runs some basic ones.
But if you plan to integrate more tests there, we can use 3.12 instead.