Change language level to 14

Author: purejava

.github/workflows/release_to_maven.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Install Java and Maven
         uses: actions/setup-java@v1
         with:
-          java-version: 11
+          java-version: 14
 
       - name: Release Maven package
         uses: samuelmeuli/action-maven-publish@v1