Update maven-deploy.yml

Author: JanHolger

.github/workflows/maven-deploy.yml

@@ -14,5 +14,5 @@ jobs:
     - name: Deploy to JavaWebStack Repository
       run: mvn deploy -s build/settings.xml
       env:
-        DEPLOYMENT_USERNAME: $DEPLOYMENT_USERNAME
-        DEPLOYMENT_PASSWORD: $DEPLOYMENT_PASSWORD
+        DEPLOYMENT_USERNAME: ${{ DEPLOYMENT_USERNAME }}
+        DEPLOYMENT_PASSWORD: ${{ DEPLOYMENT_PASSWORD }}