chore(deps): update dependency google-cloud-bigquery to v2.5.0 (#410)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-bigquery](https://togithub.com/googleapis/python-bigquery) | minor | `==2.4.0` -> `==2.5.0` |

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### Release Notes

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

### [`v2.5.0`](https://togithub.com/googleapis/python-bigquery/blob/master/CHANGELOG.md#&#8203;250-httpswwwgithubcomgoogleapispython-bigquerycomparev240v250-2020-12-02)

[Compare Source](https://togithub.com/googleapis/python-bigquery/compare/v2.4.0...v2.5.0)

##### Features

-   add `TableReference.__str__` to get table ID in standard SQL ([#&#8203;405](https://www.github.com/googleapis/python-bigquery/issues/405)) ([53dff2a](https://www.github.com/googleapis/python-bigquery/commit/53dff2ad3889af04369a22437e6ab9b92c5755b6)), closes [#&#8203;354](https://www.github.com/googleapis/python-bigquery/issues/354)
-   add progress bar for magics ([#&#8203;396](https://www.github.com/googleapis/python-bigquery/issues/396)) ([04d0273](https://www.github.com/googleapis/python-bigquery/commit/04d027317a99e3f353e0b7a18076da9b6ba4d8d3))
-   add support for unrecognized model types ([#&#8203;401](https://www.github.com/googleapis/python-bigquery/issues/401)) ([168f035](https://www.github.com/googleapis/python-bigquery/commit/168f0354c4815bd1aeadbd4e388dcc9b32f97d6b))

##### Bug Fixes

-   avoid floating point for timestamp in `insert_rows` ([#&#8203;393](https://www.github.com/googleapis/python-bigquery/issues/393)) ([a1949ae](https://www.github.com/googleapis/python-bigquery/commit/a1949ae20ec4f9c771b0cffbcd70792dd6a30dbf))

##### Performance Improvements

-   don't fetch rows when waiting for query to finish ([#&#8203;400](https://www.github.com/googleapis/python-bigquery/issues/400)) ([730df17](https://www.github.com/googleapis/python-bigquery/commit/730df17ae1ab0b0bb2454f3c134c8f62665bc51b)), closes [#&#8203;374](https://www.github.com/googleapis/python-bigquery/issues/374) [#&#8203;394](https://www.github.com/googleapis/python-bigquery/issues/394)

##### Documentation

-   **samples:** add more clustering code snippets ([#&#8203;330](https://www.github.com/googleapis/python-bigquery/issues/330)) ([809e4a2](https://www.github.com/googleapis/python-bigquery/commit/809e4a27b94ba30c10e0c9a7e89576a9de9fda2b)), closes [#&#8203;329](https://www.github.com/googleapis/python-bigquery/issues/329)

##### Dependencies

-   update required version of opentelementry for opentelemetry-exporter-google-cloud ([#&#8203;398](https://www.github.com/googleapis/python-bigquery/issues/398)) ([673a9cb](https://www.github.com/googleapis/python-bigquery/commit/673a9cb51c577c1dd016e76f3634b1e9e21482c5))

</details>

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samples/snippets/requirements.txt

@@ -1,4 +1,4 @@
-google-cloud-bigquery==2.4.0
+google-cloud-bigquery==2.5.0
 google-cloud-bigquery-storage==2.0.1
 google-auth-oauthlib==0.4.2
 grpcio==1.34.0