use 21 for Github CI

Author: oharsta

.github/workflows/build.yml

@@ -12,11 +12,12 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - uses: actions/checkout@v4
+    - name: Set up JDK 21
+      uses: actions/setup-java@v4
       with:
-        java-version: 1.8
+        distribution: 'temurin' # See 'Supported distributions' for available options
+        java-version: '21'
     - name: Set up MySQL
       uses: shogo82148/actions-setup-mysql@v1
       with:

.github/workflows/release.yml

@@ -21,10 +21,10 @@ jobs:
       - name: Check out code
         uses: actions/checkout@v4
 
-      - name: Set up JDK 1.8
+      - name: Set up JDK 21
         uses: actions/setup-java@v4
         with:
-          java-version: 8
+          java-version: 21
           distribution: "temurin"
 
       - name: Determine the version
@@ -43,21 +43,21 @@ jobs:
           exit 1
         if: github.event_name != 'workflow_dispatch' && steps.versioncheck.outputs.version != github.ref_name
 
-      - name: Set up JDK 1.8 for snapshots
+      - name: Set up JDK 21 for snapshots
         uses: actions/setup-java@v4
         with:
-          java-version: 8
+          java-version: 21
           distribution: "temurin"
           cache: "maven"
           server-id: openconext-snapshots
           server-username: MAVEN_USERNAME
           server-password: MAVEN_PASSWORD
         if: ( endsWith(steps.versioncheck.outputs.version, '-SNAPSHOT'))
 
-      - name: Set up JDK 1.8
+      - name: Set up JDK 21
         uses: actions/setup-java@v4
         with:
-          java-version: 8
+          java-version: 21
           distribution: "temurin"
           cache: "maven"
           server-id: openconext-releases