chore(deps-dev): bump @types/mocha from 7.0.2 to 8.2.1 in /backend

Bumps [@types/mocha](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/mocha) from 7.0.2 to 8.2.1.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/mocha)

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

Author: dependabot-preview[bot]

backend/package.json

@@ -131,7 +131,7 @@
 		"@types/fs-extra": "^9.0.4",
 		"@types/inquirer": "^6.5.0",
 		"@types/lodash": "^4.14.165",
-		"@types/mocha": "^7.0.0",
+		"@types/mocha": "^8.2.1",
 		"@types/node": "^10.17.21",
 		"@types/sinon": "^9.0.9",
 		"@types/ws": "^6.0.3",