Made github actions build with J21

Signed-off-by: xtrm <[email protected]>

Author: xtrm-en

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: "temurin"
-          java-version: "17"
+          java-version: "21"
 
       - uses: actions/cache@v4
         with: