chore(deps): update dependency @google-cloud/storage to v6 (#790)

[![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/storage](https://github.com/googleapis/nodejs-storage) | [`^5.0.0` -> `^6.0.0`](https://renovatebot.com/diffs/npm/@google-cloud%2fstorage/5.20.5/6.1.0) | [![age](https://badges.renovateapi.com/packages/npm/@google-cloud%2fstorage/6.1.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/@google-cloud%2fstorage/6.1.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/@google-cloud%2fstorage/6.1.0/compatibility-slim/5.20.5)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/@google-cloud%2fstorage/6.1.0/confidence-slim/5.20.5)](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, click this checkbox. ⚠ **Warning**: custom changes will be lost.

---

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/nodejs-translate).

translate/package.json

@@ -21,7 +21,7 @@
     "yargs": "^16.0.0"
   },
   "devDependencies": {
-    "@google-cloud/storage": "^5.0.0",
+    "@google-cloud/storage": "^6.0.0",
     "chai": "^4.2.0",
     "mocha": "^8.0.0",
     "uuid": "^8.0.0"