[IS-779](https://hellofresh.atlassian.net/browse/IS-779) - Disable GitHub issue creation

In order to avoid spamming the GitHub repository with issues regarding possible 
security vulnerabilities and to integrate probably within the HelloFresh project management.
The GitHub issue creation is disabled as per the [whitesource documentation](https://whitesource.atlassian.net/wiki/spaces/WD/pages/697696422/WhiteSource+for+GitHub.com#WhiteSourceforGitHub.com-IssueSettings(issueSettings))

Author: awurster

.whitesource

@@ -5,9 +5,9 @@
     "projectToken" : ""
   },
   "checkRunSettings": {
-    "vulnerableCheckRunConclusionLevel": "failure"
+    "vulnerableCheckRunConclusionLevel": "success"
   },
   "issueSettings": {
-    "minSeverityLevel": "LOW"
+    "minSeverityLevel": "NONE"
   }
-}
+}