ci: add pinned minimum dependencies test job (#324)

[IkramKhanNiazi]

Fixes #324

Pinned versions tested:

• cssselect==1.2.0
• jmespath==1.0.0
• lxml==5.1.0
• packaging==23.0
• w3lib==1.19.0

All tests pass locally under these constraints (tox -e py310: 393 passed, 2 skipped).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.18%. Comparing base (612e605) to head (8d54403).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #334   +/-   ##
=======================================
  Coverage   95.18%   95.18%           
=======================================
  Files           5        5           
  Lines         436      436           
  Branches       76       76           
=======================================
  Hits          415      415           
  Misses         13       13           
  Partials        8        8           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[IkramKhanNiazi]

@wRAR, could you please review this PR?
Thanks

[wRAR]

It should be defined as a tox env.

All tests pass locally under these constraints (tox -e py310

I don't think this makes sense, tox wouldn't read those constraints.

[IkramKhanNiazi]

[Ubuntu / Pinned minimum dependencies (Python 3.10) (pull_request)](https://github.com/scrapy/parsel/actions/runs/20637014680/job/59263370713?pr=334)

It’s working fine and has passed the checks as well. Let me know if I’m missing anything.

[wRAR]

Have you missed my comment?

[IkramKhanNiazi]

I have reviewed your comment. While the Tox tests were missed locally, the checks are passing here on the PR. Please let me know if I am missing anything or if something is not working as expected, and I will take care of it.

[wRAR]

You may have missed the first line of it. This should be defined as a separate tox env that the new CI job runs.

Please also add suitable version restrictions to install_requires when they are missing.

[IkramKhanNiazi]

Pushed the final changes!

[IkramKhanNiazi]

I have pushed the requested changes.
Thanks