fix(deps): update dependency @google-cloud/promisify to v3 (#3604)

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [@google-cloud/promisify](https://togithub.com/googleapis/nodejs-promisify) | [`^2.0.0` -> `^3.0.0`](https://renovatebot.com/diffs/npm/@google-cloud%2fpromisify/2.0.4/3.0.1) | [![age](https://badges.renovateapi.com/packages/npm/@google-cloud%2fpromisify/3.0.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/@google-cloud%2fpromisify/3.0.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/@google-cloud%2fpromisify/3.0.1/compatibility-slim/2.0.4)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/@google-cloud%2fpromisify/3.0.1/confidence-slim/2.0.4)](https://docs.renovatebot.com/merge-confidence/) |

---

### Configuration

📅 **Schedule**: Branch creation - "after 9am and before 3pm" (UTC), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Renovate will not automatically rebase this PR, because other commits have been found.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/google-cloud-node).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNC4yNC4wIiwidXBkYXRlZEluVmVyIjoiMzQuMjQuMCJ9-->

Author: renovate-bot

packages/google-cloud-translate/package.json

@@ -52,7 +52,7 @@
   },
   "dependencies": {
     "@google-cloud/common": "^4.0.0",
-    "@google-cloud/promisify": "^2.0.0",
+    "@google-cloud/promisify": "^3.0.0",
     "arrify": "^2.0.0",
     "extend": "^3.0.2",
     "google-gax": "^3.5.2",