Update publishtomavencentral.yml

Author: kikovalle

.github/workflows/publishtomavencentral.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Set up Java with Maven
         uses: actions/setup-java@v3
         with:
-          java-version: '8'
+          java-version: '21'
           distribution: 'adopt'
           server-id: ossrh
           server-username: MAVEN_USERNAME