chore(deps): bump helmet from 3.23.2 to 4.0.0

Bumps [helmet](https://github.com/helmetjs/helmet) from 3.23.2 to 4.0.0.
- [Release notes](https://github.com/helmetjs/helmet/releases)
- [Changelog](https://github.com/helmetjs/helmet/blob/master/CHANGELOG.md)
- [Commits](https://github.com/helmetjs/helmet/compare/v3.23.2...v4.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

plugins/sentry-backend/package.json

@@ -28,7 +28,7 @@
     "express": "^4.17.1",
     "express-promise-router": "^3.0.3",
     "fs-extra": "^9.0.0",
-    "helmet": "^3.22.0",
+    "helmet": "^4.0.0",
     "morgan": "^1.10.0",
     "winston": "^3.2.1",
     "yn": "^4.0.0"