chore: use JDK 21 release instead of toolchain

Author: cloudshiftchris

.github/workflows/build.yaml

@@ -31,6 +31,7 @@ jobs:
       uses: 'actions/setup-java@99b8673ff64fbf99d8d325f52d9a5bdedb8483e9' # v4.2.1
       with:
         java-version: 21
+        distribution: "temurin"
 
     # https://github.com/gradle/actions/tree/main/setup-gradle
     - name: 'Set up Gradle'