Fix pkg-config version comparator for Qt

[scpeters]

🦟 Bug fix

Fixes pkg-config test in gz-gui9 bottle test:

Summary

The pkg-config test for gz-gui9 bottle fails with:

pkg-config
gz-gui9
--cflags

Package 'gz-gui9' requires 'Qt5Widgets = 5.15' but version of Qt5Widgets is 5.15.12

The fix is to use the >= comparator when finding Qt.

Tested with this branch in using ci_matching_branch/.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (32773d6) 70.09% compared to head (bcf0378) 70.09%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #610   +/-   ##
=======================================
  Coverage   70.09%   70.09%           
=======================================
  Files          38       38           
  Lines        5350     5350           
=======================================
  Hits         3750     3750           
  Misses       1600     1600           

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