update tegonal-gh-commons to v4.1.0

and add install-shfmt.sh to cleanup.yml

Author: robstoll

.github/workflows/cleanup.yml

@@ -24,6 +24,8 @@ jobs:
       - uses: actions/checkout@v5
 
       #gt-placeholder-install-dependencies-start
+      - name: Install shfmt
+        run: ./src/ci/install-shfmt.sh
       #gt-placeholder-install-dependencies-end
 
       - name: Cleanup Sources