chore(deps): update dependency google-cloud-dlp to v3.1.0 (#159)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-dlp](https://togithub.com/googleapis/python-dlp) | `==3.0.1` -> `==3.1.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-dlp/3.1.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-dlp/3.1.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-dlp/3.1.0/compatibility-slim/3.0.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-dlp/3.1.0/confidence-slim/3.0.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v3.1.0`](https://togithub.com/googleapis/python-dlp/blob/master/CHANGELOG.md#&#8203;310-httpswwwgithubcomgoogleapispython-dlpcomparev301v310-2021-05-28)

[Compare Source](https://togithub.com/googleapis/python-dlp/compare/v3.0.1...v3.1.0)

##### Features

-   crypto_deterministic_config ([#&#8203;108](https://www.github.com/googleapis/python-dlp/issues/108)) ([#&#8203;119](https://www.github.com/googleapis/python-dlp/issues/119)) ([396804d](https://www.github.com/googleapis/python-dlp/commit/396804d65e40c1ae9ced16aa0f04ef4bdffa54c5))
-   support self-signed JWT flow for service accounts ([cdea974](https://www.github.com/googleapis/python-dlp/commit/cdea9744d0bc7244a42894acc1446080a16b2dab))

##### Bug Fixes

-   add async client ([cdea974](https://www.github.com/googleapis/python-dlp/commit/cdea9744d0bc7244a42894acc1446080a16b2dab))
-   require google-api-core>=1.22.2 ([d146cf5](https://www.github.com/googleapis/python-dlp/commit/d146cf59db14b3c3afbef72d7a86419532ad347e))
-   use correct retry deadlines ([#&#8203;96](https://www.github.com/googleapis/python-dlp/issues/96)) ([d146cf5](https://www.github.com/googleapis/python-dlp/commit/d146cf59db14b3c3afbef72d7a86419532ad347e))

##### [3.0.1](https://www.github.com/googleapis/python-dlp/compare/v3.0.0...v3.0.1) (2021-01-28)

##### Bug Fixes

-   remove gRPC send/recv limits;  add enums to `types/__init__.py` ([#&#8203;89](https://www.github.com/googleapis/python-dlp/issues/89)) ([76e0439](https://www.github.com/googleapis/python-dlp/commit/76e0439b3acfdacf9303595107c03c1d49eac8b6))

</details>

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packages/google-cloud-dlp/samples/snippets/requirements.txt

@@ -1,4 +1,4 @@
-google-cloud-dlp==3.0.1
+google-cloud-dlp==3.1.0
 google-cloud-storage==1.38.0
 google-cloud-pubsub==2.5.0
 google-cloud-datastore==2.1.3