fix: enable typing

[Borda]

seems typing with python 3.9+ does not work smoothly...

src/lightning_utilities/cli/__main__.py:5: error: Cannot find implementation or library stub for module named "fire"  [import-not-found]
src/lightning_utilities/cli/__main__.py:5: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
Found 1 error in 1 file (checked 19 source files)

ref: https://github.com/Lightning-AI/utilities/actions/runs/11898513780/job/33155190565?pr=331
cc: @dbieber

[Borda]

@dbieber do you think we can roll out this typing fix? 🙏