bump gh action java to 17 (was 11). Required for spring boot 3

Author: poblin-orange

.github/workflows/maven.yml

@@ -20,10 +20,10 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - name: Set up JDK 11
+    - name: Set up JDK
       uses: actions/setup-java@v4
       with:
-        java-version: '11'
+        java-version: '17'
         distribution: 'temurin'
         cache: maven