replacing spi.utils isHostInDenyList with core.utils isHostInDenyList

Signed-off-by: Dennis Toepker <[email protected]>

notifications/core/src/main/kotlin/org/opensearch/notifications/core/utils/ValidationHelpers.kt

@@ -20,7 +20,7 @@ fun validateUrl(urlString: String) {
 }
 
 fun validateUrlHost(urlString: String, hostDenyList: List<String>) {
-    require(!org.opensearch.notifications.spi.utils.isHostInDenylist(urlString, hostDenyList)) {
+    require(!isHostInDenylist(urlString, hostDenyList)) {
         "Host of url is denied, based on plugin setting [notification.core.http.host_deny_list]"
     }
 }