CI: Update 'setup-python' action

Author: mferrera

.github/workflows/fmu-config.yml

@@ -28,7 +28,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}