fix: Remove Firefox warnings about deprecated event props

[mister-ben]

Description

Adds mozPressure and mozInputSource to the list of event properties not to cover, as reading them triggers deprecation warnings.

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chrome, Firefox, IE)
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.14%. Comparing base (978731e) to head (6cfefb1).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8736      +/-   ##
==========================================
- Coverage   83.15%   83.14%   -0.01%     
==========================================
  Files         120      120              
  Lines        7995     7994       -1     
  Branches     1924     1922       -2     
==========================================
- Hits         6648     6647       -1     
  Misses       1347     1347              

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