fix(deps): update dependency helmet to v5.1.1

Author: renovate[bot]

package-lock.json

@@ -50,7 +50,7 @@
     "extract-zip": "2.0.1",
     "formidable": "2.0.1",
     "fs-extra": "10.1.0",
-    "helmet": "5.1.0",
+    "helmet": "5.1.1",
     "i18n": "0.15.0",
     "jsonwebtoken": "8.5.1",
     "kv-logger": "0.5.3",