build(deps-dev): bump mocha from 9.2.1 to 9.2.2 in /src

Bumps [mocha](https://github.com/mochajs/mocha) from 9.2.1 to 9.2.2.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v9.2.1...v9.2.2)

---
updated-dependencies:
- dependency-name: mocha
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

src/package.json

@@ -81,7 +81,7 @@
     "eslint": "^8.10.0",
     "eslint-config-etherpad": "^3.0.4",
     "etherpad-cli-client": "^2.0.1",
-    "mocha": "^9.1.3",
+    "mocha": "^9.2.2",
     "mocha-froth": "^0.2.10",
     "nodeify": "^1.0.1",
     "openapi-schema-validation": "^0.4.2",