chore: bump PyQt6 version

[gselzer]

This would avoid any errors arising from micro-manager/pymmcore#182 - I haven't run into any of those here yet but this does prevent me from bumping pymmcore-openscan's version, where I am running into those errors in testing.

@tlambert03 is there a reason you know of that we are enforcing PyQt6 v6.9.0 in particular?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.69%. Comparing base (e6ca514) to head (9617bd2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #170      +/-   ##
==========================================
+ Coverage   82.47%   82.69%   +0.22%     
==========================================
  Files          29       29              
  Lines        1815     1815              
==========================================
+ Hits         1497     1501       +4     
+ Misses        318      314       -4     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[tlambert03]

I don't remember these things off hand. It's always some balance of compatibilities, backed up by tests. If the pr that set it to 6.9 is not informative, and if bumping again just fixes it and doesn't break anything else, I'm definitely fine with it.

[gselzer]

I don't remember these things off hand.

Of course, just making sure 🙂

It's always some balance of compatibilities, backed up by tests. If the pr that set it to 6.9 is not informative, and if bumping again just fixes it and doesn't break anything else

All of the tests are passing on CI and things work well on my machine, so I'm going to say it is good!