Bump helmet-csp from 2.10.0 to 3.1.0 (#211)

Bumps [helmet-csp](https://github.com/helmetjs/helmet) from 2.10.0 to 3.1.0.
- [Release notes](https://github.com/helmetjs/helmet/releases)
- [Changelog](https://github.com/helmetjs/helmet/blob/master/CHANGELOG.md)
- [Commits](https://github.com/helmetjs/helmet/commits/v3.1.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Andrew Fischer <[email protected]>

Author: dependabot-preview[bot]

package-lock.json

@@ -15,7 +15,7 @@
     "express-session": "^1.17.1",
     "google-auth-library": "^6.1.6",
     "googleapis": "^48.0.0",
-    "helmet-csp": "^2.10.0",
+    "helmet-csp": "^3.1.0",
     "highlight.js": "^10.4.1",
     "js-yaml": "^3.14.0",
     "lodash": "^4.17.21",