💚 Workaround for macos ci issues (#484)

Workaround for problems with setup-python: actions/setup-python#855

Author: MiWeiss

.github/workflows/linting_and_unittests.yml

@@ -12,7 +12,8 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        # macos-latest currently has issues (https://github.com/actions/setup-python/issues/855)
+        os: [ubuntu-latest, windows-latest, macos-13]
         python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
     runs-on: ${{ matrix.os }}
     steps: