chore(deps): update dependency google-cloud-dlp to v3.1.1 (#165)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-dlp](https://github.com/googleapis/python-dlp) | `==3.1.0` -> `==3.1.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-dlp/3.1.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-dlp/3.1.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-dlp/3.1.1/compatibility-slim/3.1.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-dlp/3.1.1/confidence-slim/3.1.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v3.1.1`](https://github.com/googleapis/python-dlp/blob/master/CHANGELOG.md#&#8203;311-httpswwwgithubcomgoogleapispython-dlpcomparev310v311-2021-06-16)

[Compare Source](https://github.com/googleapis/python-dlp/compare/v3.1.0...v3.1.1)

</details>

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samples/snippets/requirements.txt

@@ -1,4 +1,4 @@
-google-cloud-dlp==3.1.0
+google-cloud-dlp==3.1.1
 google-cloud-storage==1.38.0
 google-cloud-pubsub==2.5.0
 google-cloud-datastore==2.1.3