@uppy/companion: upgrade `helmet` to v4

Fixes: https://github.com/transloadit/uppy/issues/2404

packages/@uppy/companion/package.json

@@ -46,7 +46,7 @@
     "express-request-id": "1.4.1",
     "express-session": "1.17.1",
     "grant": "4.7.0",
-    "helmet": "3.23.1",
+    "helmet": "^4.6.0",
     "ip-address": "6.2.0",
     "isobject": "3.0.1",
     "jsonwebtoken": "8.5.1",
@@ -75,7 +75,6 @@
     "@types/cors": "2.8.6",
     "@types/eslint": "^7.2.14",
     "@types/express-session": "1.17.3",
-    "@types/helmet": "0.0.37",
     "@types/jsonwebtoken": "8.3.7",
     "@types/lodash.merge": "4.6.6",
     "@types/morgan": "1.7.37",