Update how Qt is installed on CI

[alessandrofelder]

Description

What is this PR

• [x] Bug fix
• [ ] Addition of a new feature
• [ ] Other

Why is this PR needed?

pytest currently throws a fatal error, possibly related to Qt

What does this PR do?

Follows the approach to getting Qt on CI suggested on the napari zulip, and implemented in https://github.com/brainglobe/brainglobe-utils/pull/13/checks, in the hope that the tests run and pass again.

References

Closes #116

How has this PR been tested?

CI is now passing again

Is this a breaking change?

No.

Does this PR require an update to the documentation?

No

Checklist:

• [na] The code has been tested locally
• [na] Tests have been added to cover all new functionality (unit & integration)
• [na] The documentation has been updated to reflect any changes
• [x] The code has been formatted with pre-commit

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (7551633) 97.44% compared to head (147da4c) 97.44%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #117 +/- ## ======================================= Coverage 97.44% 97.44% ======================================= Files 8 8 Lines 391 391 ======================================= Hits 381 381 Misses 10 10 ```

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