chore(deps): update dependency jsdoc-region-tag to v3 (googleapis#1802)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [jsdoc-region-tag](https://togithub.com/googleapis/jsdoc-region-tag) | [`^2.0.0` -> `^3.0.0`](https://renovatebot.com/diffs/npm/jsdoc-region-tag/2.0.1/3.0.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/jsdoc-region-tag/3.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/jsdoc-region-tag/3.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/jsdoc-region-tag/2.0.1/3.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/jsdoc-region-tag/2.0.1/3.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/jsdoc-region-tag (jsdoc-region-tag)</summary>

### [`v3.0.0`](https://togithub.com/googleapis/jsdoc-region-tag/blob/HEAD/CHANGELOG.md#300-2023-08-10)

[Compare Source](https://togithub.com/googleapis/jsdoc-region-tag/compare/v2.0.1...v3.0.0)

##### ⚠ BREAKING CHANGES

-   upgrade to Node 14 ([#&#8203;126](https://togithub.com/googleapis/jsdoc-region-tag/issues/126))

##### Miscellaneous Chores

-   Upgrade to Node 14 ([#&#8203;126](https://togithub.com/googleapis/jsdoc-region-tag/issues/126)) ([76629d1](https://togithub.com/googleapis/jsdoc-region-tag/commit/76629d1cb4bd93ee3177edb6e54ce7f3e935787d))

</details>

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package.json

@@ -86,7 +86,7 @@
     "gts": "^5.0.0",
     "jsdoc": "^4.0.0",
     "jsdoc-fresh": "^2.0.0",
-    "jsdoc-region-tag": "^2.0.0",
+    "jsdoc-region-tag": "^3.0.0",
     "linkinator": "^5.0.0",
     "mocha": "^9.2.2",
     "mv": "^2.1.1",