fix(deps): update dependency google-gax to v2.29.0 (#1452)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-gax](https://github.com/googleapis/gax-nodejs) | [`2.28.1` -> `2.29.0`](https://renovatebot.com/diffs/npm/google-gax/2.28.1/2.29.0) | [![age](https://badges.renovateapi.com/packages/npm/google-gax/2.29.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/google-gax/2.29.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/google-gax/2.29.0/compatibility-slim/2.28.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/google-gax/2.29.0/confidence-slim/2.28.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/gax-nodejs</summary>

### [`v2.29.0`](https://github.com/googleapis/gax-nodejs/blob/HEAD/CHANGELOG.md#&#8203;2290-httpswwwgithubcomgoogleapisgax-nodejscomparev2281v2290-2022-01-05)

[Compare Source](https://github.com/googleapis/gax-nodejs/compare/v2.28.1...v2.29.0)

##### Features

-   map http status code to grpc status code ([#&#8203;1135](https://www.github.com/googleapis/gax-nodejs/issues/1135)) ([772222f](https://www.github.com/googleapis/gax-nodejs/commit/772222f1d2e269ceb96bce71c0f18942507f3d4b))
-   support server stream for REST ([#&#8203;1122](https://www.github.com/googleapis/gax-nodejs/issues/1122)) ([9f62723](https://www.github.com/googleapis/gax-nodejs/commit/9f62723762eb72566997e6c8518517e8efddd62d))

##### [2.28.1](https://www.github.com/googleapis/gax-nodejs/compare/v2.28.0...v2.28.1) (2021-11-10)

##### Bug Fixes

-   handle stream has no metadata event ([#&#8203;1132](https://www.github.com/googleapis/gax-nodejs/issues/1132)) ([ad29bc2](https://www.github.com/googleapis/gax-nodejs/commit/ad29bc26567b588d5d694350844bea5de40963d6))

</details>

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package.json

@@ -58,7 +58,7 @@
     "arrify": "^2.0.0",
     "extend": "^3.0.2",
     "google-auth-library": "^7.0.0",
-    "google-gax": "2.28.1",
+    "google-gax": "2.29.0",
     "is-stream-ended": "^0.1.4",
     "lodash.snakecase": "^4.1.1",
     "p-defer": "^3.0.0"