fix test url

Author: dariuszkuc

.github/workflows/graalvm-integration.yml

@@ -66,7 +66,7 @@ jobs:
           curl --request POST \
             --verbose \
             --header 'content-type: application/json' \
-            --url http://localhost:8080/ \
+            --url http://localhost:8080/graphql \
             --data '{"query":"query($inputArg: InputOnlyInput){ inputTypeQuery(arg: $inputArg) }","variables":{"inputArg": { "id": 123 }}}' \
             > response.json