Gradle doesn't support Java 19 yet

Author: jeffgbutler

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        java: [11, 17, 19-ea]
+        java: [11, 17, 18]
         distribution: ['zulu']
       fail-fast: false
       max-parallel: 4