chore(deps): update dependency google-cloud-datalabeling to v1.2.1 (#126)

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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) | `==1.2.0` -> `==1.2.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-datalabeling/1.2.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-datalabeling/1.2.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-datalabeling/1.2.1/compatibility-slim/1.2.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-datalabeling/1.2.1/confidence-slim/1.2.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.2.1`](https://togithub.com/googleapis/python-datalabeling/blob/master/CHANGELOG.md#&#8203;121-httpswwwgithubcomgoogleapispython-datalabelingcomparev120v121-2021-07-20)

[Compare Source](https://togithub.com/googleapis/python-datalabeling/compare/v1.2.0...v1.2.1)

</details>

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datalabeling/snippets/requirements.txt

@@ -1 +1 @@
-google-cloud-datalabeling==1.2.0
+google-cloud-datalabeling==1.2.1