Use Java 21 in github workflows.

Author: wrandelshofer

.github/workflows/codeql.yml

@@ -42,11 +42,11 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v3
 
-      - name: Setup Java 17
+      - name: Setup Java 21
         uses: actions/setup-java@v3
         with:
           distribution: "temurin"
-          java-version: "17"
+          java-version: "21"
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL

.github/workflows/maven-publish.yml

@@ -17,10 +17,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v3
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'temurin'
         server-id: github # Value of the distributionManagement/repository/id field of the pom.xml
         settings-path: ${{ github.workspace }} # location for the settings.xml file

.github/workflows/maven.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest ]
-        java: [ 17 ]
+        java: [ 21 ]
         arch: [ x64 ]
         dist: [ zulu ]
       fail-fast: false