chore: update java version for java formatter (#336)

Author: akerekes

.github/workflows/lint.yaml

@@ -46,7 +46,7 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@3a4f6e1af504cf6a31855fa899c6aa5355ba6c12 # v4.7.0
         with:
-          java-version: 17.x
+          java-version: 21.x
           distribution: temurin
       - name: Run formatter
         id: formatter