Try upping build to JDK 21.

Author: tecarter94

.github/workflows/java-ci.yml

@@ -17,11 +17,11 @@ jobs:
           key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
           restore-keys: |
             ${{ runner.os }}-maven-
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@b36c23c0d998641eff861008f374ee103c25ac73 # v4
         with:
           distribution: 'temurin'
-          java-version: 17
+          java-version: 21
       - name: Set up Maven
         uses: stCarolas/setup-maven@d6af6abeda15e98926a57b5aa970a96bb37f97d1 # v5
         with: