fix: specify test dependencies required for CI

[deependujha]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes # (issue).

Why this is required?

There're some tests which are skipped if dependency is not found. This pr makes sure they get tested in CI.

Without this pr:

https://github.com/Lightning-AI/litData/actions/runs/15850793770/job/44683478247?pr=631#step:5:586
10 tests are skipped

After this pr:

https://github.com/Lightning-AI/litData/actions/runs/15855101854/job/44698284723?pr=634#step:5:583
5 tests are skipped (which are explicitly marked to be skipped)

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83%. Comparing base (e0c6ffe) to head (3793245).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #634   +/-   ##
===================================
  Coverage    83%    83%           
===================================
  Files        43     43           
  Lines      6609   6609           
===================================
+ Hits       5492   5505   +13     
+ Misses     1117   1104   -13     

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