chore(deps): update dependency flatted to v3.3.3

Author: renovate[bot]

package.json

@@ -21,7 +21,7 @@
         "cookies": "0.8.0",
         "file-stream-rotator": "0.6.1",
         "winston-daily-rotate-file": "4.7.1",
-        "flatted": "3.2.7",
+        "flatted": "3.3.3",
         "@socket.io/sticky": "1.0.2",
         "promise-coalesce": "1.1.2",
         "cache-manager": "5.3.2"