fix java version in workflow

Author: pschichtel

.github/workflows/publish.yaml

@@ -7,10 +7,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Set up JDK 17
+      - name: Set up JDK
         uses: actions/setup-java@v4
         with:
-          java-version: 17
+          java-version: 21
           distribution: temurin
           server-id: ossrh
           server-username: MAVEN_USERNAME
@@ -25,4 +25,4 @@ jobs:
         env:
           MAVEN_USERNAME: ${{ secrets.MAVEN_USERNAME }}
           MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}
-        run: mvn -U package deploy
+        run: mvn -U package deploy