update flaky syntax

[Borda]

What does this PR do?

fix syntax for tests wrapped as flaky

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📚 Documentation preview 📚: https://pytorch-lightning--21156.org.readthedocs.build/en/21156/

[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 tests/tests_pytorch/callbacks/test_spike.py.

🟢 pytorch_lightning: Azure GPU

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

These checks are required after the changes to tests/tests_pytorch/callbacks/test_spike.py.

🟢 lightning_fabric: CPU workflow

Check ID	Status
fabric-cpu-guardian	success	✅

These checks are required after the changes to tests/tests_fabric/utilities/test_spike.py.

🟢 lightning_fabric: Azure GPU

Check ID	Status
lightning-fabric (GPUs) (testing Fabric | oldest)	success	✅
lightning-fabric (GPUs) (testing Fabric | latest)	success	✅
lightning-fabric (GPUs) (testing Lightning | latest)	success	✅

These checks are required after the changes to tests/tests_fabric/utilities/test_spike.py.

---

Thank you for your contribution! 💜

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87%. Comparing base (cdc0db4) to head (6255038).
⚠️ Report is 4 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21156   +/-   ##
=======================================
  Coverage      87%      87%           
=======================================
  Files         269      269           
  Lines       23595    23595           
=======================================
+ Hits        20579    20582    +3     
+ Misses       3016     3013    -3