compile with JDK 21

.forgejo/workflows/build.yaml

@@ -4,10 +4,10 @@ jobs:
     runs-on: node-16
     steps:
       - uses: https://github.com/actions/checkout@v4
-      - name: Set up JDK 22
+      - name: Set up JDK 21
         uses: https://github.com/actions/setup-java@v4
         with:
-          java-version: '22'
+          java-version: '21'
           distribution: 'temurin'
           cache: maven
       - name: Set up Maven

pom.xml

@@ -15,8 +15,8 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.source>22</maven.compiler.source>
-    <maven.compiler.target>22</maven.compiler.target>
+    <maven.compiler.source>21</maven.compiler.source>
+    <maven.compiler.target>21</maven.compiler.target>
   </properties>
 
   <dependencies>