[BUG] Click and Button Presses don't work on Windows CI with `pympl` dependency

If someone had just a moment, it would be tremendously helpful to get some feedback about the failed CIs here https://github.com/mne-tools/mne-python/pull/10913. Basically, the tests that use fake clicking and key presses with matplotlib fail when ipympl is added as a dependency but only on Windows. I've checked and they pass locally on MacOS as well as on the CIs. Is there some global variable or setting that ipympl might be modifying and maybe we could change it back? The difference between all the 22 tests failing and all the tests passing was just adding ipympl to the dependencies list, it was run before and after adding those. Thanks!

Beginne mit der fehlgeschlagenen Windows-CI in pull request #10913 und identifiziere die 22 Tests, die Klicks und Tastendrücke in matplotlib simulieren. Vergleiche Läufe vor und nach dem Hinzufügen von ipympl zu den Abhängigkeiten und ermittle anschließend, welche Änderung dafür sorgt, dass diese Tests unter Windows mit vorhandener Abhängigkeit bestehen.