ci: force pip install with --upgrade-strategy=eager

[Borda]

What does this PR do?

as discovered with BnB fixing we sometimes sticked too much with cached packages so automated bumps by @dependabot may not really test the latest versions

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📚 Documentation preview 📚: https://pytorch-lightning--20958.org.readthedocs.build/en/20958/

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 pytorch_lightning: Tests workflow

Check ID	Status
pl-cpu-guardian	success	✅

These checks are required after the changes to .github/workflows/ci-tests-pytorch.yml.

🟢 pytorch_lightning: Azure GPU

Check ID	Status
pytorch-lightning (GPUs) (testing Lightning | latest)	success	✅
pytorch-lightning (GPUs) (testing PyTorch | latest)	success	✅

These checks are required after the changes to .azure/gpu-tests-pytorch.yml.

🟢 lightning_fabric: CPU workflow

Check ID	Status
fabric-cpu-guardian	success	✅

These checks are required after the changes to .github/workflows/ci-tests-fabric.yml.

---

Thank you for your contribution! 💜

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86%. Comparing base (73f1ab8) to head (0447c49).
⚠️ Report is 192 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #20958    +/-   ##
========================================
- Coverage      87%      86%    -1%     
========================================
  Files         268      268            
  Lines       23460    23460            
========================================
- Hits        20402    20266   -136     
- Misses       3058     3194   +136