chore(deps): update dependency google-cloud-datalabeling to v1.2.0 (#119

)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-datalabeling](https://togithub.com/googleapis/python-datalabeling) | `==1.1.0` -> `==1.2.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-datalabeling/1.2.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-datalabeling/1.2.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-datalabeling/1.2.0/compatibility-slim/1.1.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-datalabeling/1.2.0/confidence-slim/1.1.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/python-datalabeling</summary>

### [`v1.2.0`](https://togithub.com/googleapis/python-datalabeling/blob/master/CHANGELOG.md#&#8203;120-httpswwwgithubcomgoogleapispython-datalabelingcomparev110v120-2021-07-12)

[Compare Source](https://togithub.com/googleapis/python-datalabeling/compare/v1.1.0...v1.2.0)

##### Features

-   add always_use_jwt_access ([#&#8203;113](https://www.github.com/googleapis/python-datalabeling/issues/113)) ([416b3e9](https://www.github.com/googleapis/python-datalabeling/commit/416b3e9e15d7b147c69391133cb4576c64a41a82))

##### Bug Fixes

-   disable always_use_jwt_access ([#&#8203;117](https://www.github.com/googleapis/python-datalabeling/issues/117)) ([8c50b89](https://www.github.com/googleapis/python-datalabeling/commit/8c50b899ff1cee04af36fc5f2dae68ba721efdae))

##### Documentation

-   omit mention of Python 2.7 in 'CONTRIBUTING.rst' ([#&#8203;1127](https://www.github.com/googleapis/python-datalabeling/issues/1127)) ([#&#8203;108](https://www.github.com/googleapis/python-datalabeling/issues/108)) ([2d38075](https://www.github.com/googleapis/python-datalabeling/commit/2d38075bd68c083ed164a7202fd65056ff1edbc8)), closes [#&#8203;1126](https://www.github.com/googleapis/python-datalabeling/issues/1126)

</details>

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datalabeling/snippets/requirements.txt

@@ -1 +1 @@
-google-cloud-datalabeling==1.1.0
+google-cloud-datalabeling==1.2.0