[MNT] migrate test-deps-2025 to use uv date cutoffs

[RUPESH-KUMAR01]

Reference Issues/PRs

Fixes #2054
Related: sktime/sktime#9383

What does this implement/fix? Explain your changes.

Replaces the explicit dependency set with uv’s UV_EXCLUDE_NEWER to install dependencies from a time-frozen snapshot.

What should a reviewer concentrate their feedback on?

Correct usage of UV_EXCLUDE_NEWER for timestamp regression testing

Cutoff date choice (2025-01-01) and whether it matches project expectations

Did you add any tests for the change?

No new tests added, as this change only affects CI configuration.

Any other comments?

PR checklist

• The PR title starts with either [ENH], [MNT], [DOC], or [BUG]. [BUG] - bugfix, [MNT] - CI, test framework, [ENH] - adding or improving code, [DOC] - writing or improving documentation or docstrings.
• Added/modified tests
• Used pre-commit hooks when committing to ensure that code is compliant with hooks. Install hooks with pre-commit install.
  To run hooks independent of commit, execute pre-commit run --all-files

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[RUPESH-KUMAR01]

The cutoff date was set to 2025-10-10 to maintain compatibility with skbase. Earlier dates resolved to versions that did not include _safe_import, which led to test collection errors. The cutoff date was therefore chosen based on dependency compatibility.

[phoeenniixx]

FYI @fkiraly, please have a look at this!

[fkiraly]

I see - scikit-base has no dependencies itself.

Is there a way to make 2024 and 2025 timestamps apply for all other packages except scikit-base, but keeping scikit-base at the newest possible version?

[RUPESH-KUMAR01]

Hi @fkiraly,
The tests will now run with scikit-base at the latest version, while the rest of the packages will use a cutoff date of 2025-01-01. Please let me know if we should choose a different cutoff date.