Remove JDK 17 from CI, can't test until build requires Java 8 (that is, target not Java 6)

Author: cowtowncoder

.github/workflows/main.yml

@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
       matrix:
         # 01-May-2022, tatu: Until we require Java 8, cannot test against JDK 17 or above
-        java_version: ['8', '11', '17']
+        java_version: ['8', '11']
     env:
       JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
     steps: