Merge pull request matplotlib#25619 from ksunden/unbreak_pyside65

TST: Unbreak pyside65 by installing libxcb-cursor0

Author: jklymak

.github/workflows/tests.yml

@@ -103,6 +103,7 @@ jobs:
               libgirepository1.0-dev \
               libsdl2-2.0-0 \
               libxkbcommon-x11-0 \
+              libxcb-cursor0 \
               libxcb-icccm4 \
               libxcb-image0 \
               libxcb-keysyms1 \