Bump convict from 5.2.1 to 6.2.2

Bumps [convict](https://github.com/mozilla/node-convict) from 5.2.1 to 6.2.2.
- [Release notes](https://github.com/mozilla/node-convict/releases)
- [Changelog](https://github.com/mozilla/node-convict/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mozilla/node-convict/compare/v5.2.1...v6.2.2)

---
updated-dependencies:
- dependency-name: convict
  dependency-type: direct:production
...

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package.json

@@ -140,7 +140,7 @@
     "choo": "^7.0.0",
     "cldr-core": "^35.1.0",
     "configstore": "github:dannycoates/configstore#master",
-    "convict": "^5.2.1",
+    "convict": "^6.2.2",
     "double-ended-queue": "^2.1.0-0",
     "express": "^4.17.3",
     "helmet": "^3.23.3",