build(deps-dev): bump mocha from 10.2.0 to 10.3.0 in /src (#6143)

Bumps [mocha](https://github.com/mochajs/mocha) from 10.2.0 to 10.3.0.
- [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/v10.2.0...v10.3.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/package.json

@@ -87,7 +87,7 @@
     "eslint": "^8.56.0",
     "eslint-config-etherpad": "^3.0.22",
     "etherpad-cli-client": "^2.0.2",
-    "mocha": "^10.0.0",
+    "mocha": "^10.3.0",
     "mocha-froth": "^0.2.10",
     "nodeify": "^1.0.1",
     "openapi-schema-validation": "^0.4.2",