Merge pull request #727 from rhusar/ci-jdk21ea

CI: JDK 21-EA is now available.

Author: belaban

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         os: [ ubuntu-latest, windows-latest, macos-latest ]
         # Keep this list as: all supported LTS JDKs, the latest GA JDK, and the latest EA JDK (if available).
-        java: [ 11, 17, 20 ]
+        java: [ 11, 17, 20, 21-ea ]
     steps:
       - name: Checkout
         uses: actions/checkout@v3