Fix tests for Python 3.14

[karpetrosyan]

Based on #3721. Ensures that CI checks are passing for 3.14

[tadeboro]

Out of 2k changes in this PR, only cca. 30 lines are actually related to Python 3.14 support. You should split your PR into two to keep them focused: one for adding Pythoin 3.14 support, and another one for uv shenanigans.

[karpetrosyan]

Out of 2k changes in this PR, only cca. 30 lines are actually related to Python 3.14 support. You should split your PR into two to keep them focused: one for adding Pythoin 3.14 support, and another one for uv shenanigans.

It’s just based on these 2k changes, and we can take the last 30-line change commit and commit it separately if we decide to.

[tadeboro]

It’s just based on these 2k changes, and we can take the last 30-line change commit and commit it separately if we decide to.

There are no "clean" commits in this PR right now when it comes to Python compatibility fixes. be7ef24 is fairly close, but even that one touches uv.lock file.