chore(deps): update dependency google-cloud-bigquery-datatransfer to v3 (#81)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-bigquery-datatransfer](https://togithub.com/googleapis/python-bigquery-datatransfer) | major | `==2.1.0` -> `==3.0.0` |

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### Release Notes

<details>
<summary>googleapis/python-bigquery-datatransfer</summary>

### [`v3.0.0`](https://togithub.com/googleapis/python-bigquery-datatransfer/blob/master/CHANGELOG.md#&#8203;300-httpswwwgithubcomgoogleapispython-bigquery-datatransfercomparev210v300-2020-12-09)

[Compare Source](https://togithub.com/googleapis/python-bigquery-datatransfer/compare/v2.1.0...v3.0.0)

##### ⚠ BREAKING CHANGES

-   type is renamed to type\_ to avoid conflict with built-in functions (introduced in [googleapis/gapic-generator-python#&#8203;595](https://togithub.com/googleapis/gapic-generator-python/issues/595))

##### Features

-   add common resource path helpers ([#&#8203;69](https://www.github.com/googleapis/python-bigquery-datatransfer/issues/69)) ([e0bcedb](https://www.github.com/googleapis/python-bigquery-datatransfer/commit/e0bcedb58109e38a58584d5b3087f03e1fa10835))

##### Bug Fixes

-   avoid collision with built-in functions by renaming type property to type\_ ([#&#8203;53](https://www.github.com/googleapis/python-bigquery-datatransfer/issues/53)) ([b954411](https://www.github.com/googleapis/python-bigquery-datatransfer/commit/b95441140f7c86dd3e833aef0532badd6280ef48)), closes [/github.com/googleapis/python-talent/blob/ef045e8eb348db36d7a2a611e6f26b11530d273b/samples/snippets/noxfile_config.py#L27-L32](https://www.github.com/googleapis//github.com/googleapis/python-talent/blob/ef045e8eb348db36d7a2a611e6f26b11530d273b/samples/snippets/noxfile_config.py/issues/L27-L32)

##### Documentation

-   update intersphinx links ([#&#8203;78](https://www.github.com/googleapis/python-bigquery-datatransfer/issues/78)) ([a78ba39](https://www.github.com/googleapis/python-bigquery-datatransfer/commit/a78ba39bf1507cbc9e2a51fe4553d602da7f7601))

</details>

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bigquery-datatransfer/snippets/requirements.txt

@@ -1 +1 @@
-google-cloud-bigquery-datatransfer==2.1.0
+google-cloud-bigquery-datatransfer==3.0.0