chore(deps): update maven docker tag to v3.9.4

Author: renovate[bot]

test-in-k8s.yaml

@@ -24,7 +24,7 @@ spec:
   serviceAccountName: jenkins
   containers:
   - name: jenkins
-    image: maven:3.9.3-eclipse-temurin-17
+    image: maven:3.9.4-eclipse-temurin-17
     command:
       - sleep
     args: