chore(deps): update dependency @types/mocha to v9 (#3)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [@types/mocha](https://togithub.com/DefinitelyTyped/DefinitelyTyped) | [`^8.2.2` -> `^9.0.0`](https://renovatebot.com/diffs/npm/@types%2fmocha/8.2.3/9.1.1) | [![age](https://badges.renovateapi.com/packages/npm/@types%2fmocha/9.1.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/@types%2fmocha/9.1.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/@types%2fmocha/9.1.1/compatibility-slim/8.2.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/@types%2fmocha/9.1.1/confidence-slim/8.2.3)](https://docs.renovatebot.com/merge-confidence/) |

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packages/google-cloud-apigeeregistry/package.json

@@ -42,7 +42,7 @@
         "google-gax": "^3.1.3"
     },
     "devDependencies": {
-        "@types/mocha": "^8.2.2",
+        "@types/mocha": "^9.0.0",
         "@types/node": "^14.14.44",
         "@types/sinon": "^10.0.0",
         "c8": "^7.7.2",