Bump @types/mocha from 5.2.7 to 9.0.0 (#549)

Bumps [@types/mocha](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/mocha) from 5.2.7 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>
Co-authored-by: Nikitha Chettiar <nikithauc@gmail.com>

package.json

@@ -81,7 +81,7 @@
 		"@rollup/plugin-commonjs": "^17.0.0",
 		"@rollup/plugin-node-resolve": "^11.1.0",
 		"@types/chai": "^4.2.14",
-		"@types/mocha": "^5.2.7",
+		"@types/mocha": "^9.0.0",
 		"@types/node": "^12.0.10",
 		"@types/sinon": "^9.0.9",
 		"@typescript-eslint/eslint-plugin": "^3.8.0",