NO-JIRA: update GHA job to use JDK21 now that Temurin 21 is out
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0ee2578..2bc6cc0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -8,7 +8,7 @@
     strategy:
       fail-fast: false
       matrix:
-        java: [ 8, 11, 17 ]
+        java: [ 8, 11, 17, 21 ]
 
     steps:
       - uses: actions/checkout@v3