Build/test with Java 21

Signed-off-by: Chad Wilson <[email protected]>

Author: chadlwilson

.github/workflows/functional-test.yml

@@ -41,7 +41,7 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: 'temurin'
-          java-version: '17'
+          java-version: '21'
 
       - name: Run FTs
         run: |