add kotlin 1.8 to integration tests (#179)

Author: andrewparmet

.circleci/config.yml

@@ -119,7 +119,7 @@ workflows:
           matrix:
             parameters:
               jdk: ["8", "11", "17"]
-              kotlin: ["1.5.32", "1.6.21", "1.7.20"]
+              kotlin: ["1.5.32", "1.6.21", "1.7.20", "1.8.0"]
       - release:
           context: OSS
           filters: