Update hook project wiki event wqattribute to wiki_page_events

In GitLab 11.11, the Project Hook Key for wiki events was wiki_events.
We don't support GitLab 11.X. We only support GitLab 12.9.2+.
In new version of GitLab the correct key is wiki_page_events.

Author: jabby

Diff for: src/main/java/org/gitlab4j/api/ProjectApi.java

@@ -2066,7 +2066,7 @@ public ProjectHook addHook(Object projectIdOrPath, String url, ProjectHook enabl
                 .withParam("confidential_note_events", enabledHooks.getConfidentialNoteEvents(), false)
                 .withParam("job_events", enabledHooks.getJobEvents(), false)
                 .withParam("pipeline_events", enabledHooks.getPipelineEvents(), false)
-                .withParam("wiki_events", enabledHooks.getWikiPageEvents(), false)
+                .withParam("wiki_page_events", enabledHooks.getWikiPageEvents(), false)
                 .withParam("enable_ssl_verification", enableSslVerification, false)
                 .withParam("repository_update_events", enabledHooks.getRepositoryUpdateEvents(), false)
                 .withParam("token", secretToken, false);
@@ -2146,7 +2146,7 @@ public ProjectHook modifyHook(ProjectHook hook) throws GitLabApiException {
             .withParam("note_events", hook.getNoteEvents(), false)
             .withParam("job_events", hook.getJobEvents(), false)
             .withParam("pipeline_events", hook.getPipelineEvents(), false)
-            .withParam("wiki_events", hook.getWikiPageEvents(), false)
+            .withParam("wiki_page_events", hook.getWikiPageEvents(), false)
             .withParam("enable_ssl_verification", hook.getEnableSslVerification(), false)
             .withParam("token", hook.getToken(), false);