SEBSERV-730 Java update to Java 21

Author: anhefti

.github/workflows/build.yml

@@ -20,10 +20,10 @@ jobs:
       name: Checkout repository
       uses: actions/[email protected]
     -
-      name: Set up JDK 17
+      name: Set up JDK 21
       uses: actions/[email protected]
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'adopt'
     -
       name: Cache Maven packages
@@ -63,10 +63,10 @@ jobs:
       name: Checkout repository
       uses: actions/[email protected]
     -
-      name: Set up JDK 17
+      name: Set up JDK 21
       uses: actions/[email protected]
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'adopt'
     -
       name: Cache Maven packages