chore(deps-dev): bump @types/mocha from 7.0.2 to 9.0.0 (#7645)

Bumps [@types/mocha](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/mocha) from 7.0.2 to 9.0.0.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/mocha)

---
updated-dependencies:
- dependency-name: "@types/mocha"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

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

package.json

@@ -78,7 +78,7 @@
     "@microsoft/api-extractor": "7.15.1",
     "@types/debug": "0.0.31",
     "@types/mime": "2.0.3",
-    "@types/mocha": "7.0.2",
+    "@types/mocha": "9.0.0",
     "@types/node": "14.14.45",
     "@types/proxy-from-env": "1.0.1",
     "@types/rimraf": "2.0.2",