Update actions/setup-python action to v6 (#5915)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/formal-verification.yml

@@ -44,7 +44,7 @@ jobs:
           fi
           echo "result=$RESULT" >> "$GITHUB_OUTPUT"
       - name: Install python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PIP_VERSION }}
           cache: 'pip'
@@ -75,7 +75,7 @@ jobs:
       - name: Set up environment
         uses: ./.github/actions/setup
       - name: Install python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PIP_VERSION }}
           cache: 'pip'