Tests: Remove obsolete Python version skips

[nightcityblade]

Fixes #271

Summary

• remove obsolete Python 3.7 skip conditions now that the project requires Python 3.10+
• retain the relevant SQLAlchemy, pandas, Dask, and Python 3.13 compatibility guards
• allow the DataFrame doctest coverage to run on every supported Python version

Validation

• uv run poe lint
• uv run pytest -q tests/bulk_test.py (2 passed, 3 skipped)
• tests/test_support_pandas.py against CrateDB 6.5.0 (5 passed)
• tests/integration.py against CrateDB 6.5.0 (6 passed)

[coderabbitai]

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[florinutz]

looks good, and thank you for the contribution!

please also have a look at tests/vector_test.py:147, pyproject.toml:81-85 and docs/dataframe.rst:60-61

[nightcityblade]

Replacement PR: #299

During follow-up, an amend in a shallow clone briefly disconnected this source branch, causing GitHub to auto-close the PR. I rebuilt the change from current upstream main on a fresh branch, preserved the reviewed changes, applied the requested follow-ups, and reran validation. Apologies for the disruption.