Update watchdog dependency

[ankona]

Updated watchdog dependency pin to next major version and removed type: ignore where possible due to new type hints added to watchdog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.70%. Comparing base (505de50) to head (c61f478).
Report is 1 commits behind head on develop.

❗ Current head c61f478 differs from pull request most recent head e7eb2ce. Consider uploading reports for the commit e7eb2ce to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #540      +/-   ##
===========================================
- Coverage    90.76%   90.70%   -0.07%     
===========================================
  Files           65       65              
  Lines         4528     4498      -30     
===========================================
- Hits          4110     4080      -30     
  Misses         418      418              

Files	Coverage Δ
smartsim/_core/utils/telemetry/telemetry.py	90.57% <100.00%> (ø)

... and 3 files with indirect coverage changes

[AlyssaCote]

This looks great! The only thing holding up the approval for me is I'm curious why the self._observer starts and stops don't have their # type: ignore comments removed because it looks like BaseObserver is a watchdog class.

Answered offline. Should be good!

[AlyssaCote]

Thanks for answering my lingering question!