updated Oracle Community's username_claimed

The username 'blue' does not exist anymore, therefore we are using the
username 'dev' instead.

sherlock/resources/data.json

@@ -1050,7 +1050,7 @@
     "errorType": "status_code",
     "url": "https://community.oracle.com/people/{}",
     "urlMain": "https://community.oracle.com",
-    "username_claimed": "blue",
+    "username_claimed": "dev",
     "username_unclaimed": "noonewouldeverusethis7"
   },
   "Otzovik": {