chore(deps): update dependency google-cloud-dlp to v3 (#82)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-dlp](https://github.com/googleapis/python-dlp) | major | `==2.0.0` -> `==3.0.0` |

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### Release Notes

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

### [`v3.0.0`](https://github.com/googleapis/python-dlp/blob/master/CHANGELOG.md#&#8203;300-httpswwwgithubcomgoogleapispython-dlpcomparev200v300-2020-12-02)

[Compare Source](https://github.com/googleapis/python-dlp/compare/v2.0.0...v3.0.0)

##### ⚠ BREAKING CHANGES

-   rename fields that collide with builtins ([#&#8203;75](https://github.com/googleapis/python-dlp/issues/75))
    -   `ByteContentItem.type` -> `ByteContentItem.type_`
    -   `MetadataLocation.type` -> `MetadataLocation.type_`
    -   `Container.type` -> `Container.type_`
    -   `Bucket.min` -> `Bucket.min_`
    -   `Bucket.max`-> `Bucket.max_`
    -   `DlpJob.type` -> `DlpJob.type_`
    -   `GetDlpJobRequest.type` -> `GetDlpJobRequest.type_`

##### Bug Fixes

-   rename fields that collide with builtins; retrieve job config for risk analysis jobs ([#&#8203;75](https://www.github.com/googleapis/python-dlp/issues/75)) ([4f3148e](https://www.github.com/googleapis/python-dlp/commit/4f3148e93ec3dfc9395aa38a3afc62498500a055))

##### Documentation

-   **samples:** fix README to accurately reflect the new repo after the move ([#&#8203;72](https://www.github.com/googleapis/python-dlp/issues/72)) ([dc56806](https://www.github.com/googleapis/python-dlp/commit/dc56806b47f92227e396969d8a583b881aa41fd1))

</details>

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dlp/snippets/requirements.txt

@@ -1,4 +1,4 @@
-google-cloud-dlp==2.0.0
+google-cloud-dlp==3.0.0
 google-cloud-storage==1.33.0
 google-cloud-pubsub==1.7.0
 google-cloud-datastore==1.15.3