Bump helmet from 5.1.0 to 6.0.1

Bumps [helmet](https://github.com/helmetjs/helmet) from 5.1.0 to 6.0.1.
- [Release notes](https://github.com/helmetjs/helmet/releases)
- [Changelog](https://github.com/helmetjs/helmet/blob/main/CHANGELOG.md)
- [Commits](helmetjs/helmet@v5.1.0...v6.0.1)

---
updated-dependencies:
- dependency-name: helmet
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -37,7 +37,7 @@
     "hast-util-select": "^5.0.2",
     "hast-util-to-string": "^2.0.0",
     "hastscript": "^7.0.2",
-    "helmet": "^5.1.0",
+    "helmet": "^6.0.1",
     "highlight.js": "11.5.1",
     "highlightjs-curl": "^1.3.0",
     "highlightjs-graphql": "^1.0.2",