Bump test dependency for helidon to version 2.2.2

Author: rbygrave

tests/test-helidon/pom.xml

@@ -16,7 +16,7 @@
 
   <properties>
     <mainClass>org.example.Main</mainClass>
-    <helidon-version>2.0.2</helidon-version>
+    <helidon-version>2.2.2</helidon-version>
     <avaje-http-version>1.4-SNAPSHOT</avaje-http-version>
   </properties>