Update dependency google-cloud-bigquery to v1.25.0 [(#4024)](GoogleCloudPlatform/python-docs-samples#4024)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-bigquery](https://togithub.com/googleapis/python-bigquery) | minor | `==1.24.0` -> `==1.25.0` |

---

### Release Notes

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

### [`v1.25.0`](https://togithub.com/googleapis/python-bigquery/blob/master/CHANGELOG.md#&#8203;1250-httpswwwgithubcomgoogleapispython-bigquerycomparev1240v1250-2020-06-06)

[Compare Source](https://togithub.com/googleapis/python-bigquery/compare/v1.24.0...v1.25.0)

##### Features

-   add BigQuery storage client support to DB API ([#&#8203;36](https://www.github.com/googleapis/python-bigquery/issues/36)) ([ba9b2f8](https://www.github.com/googleapis/python-bigquery/commit/ba9b2f87e36320d80f6f6460b77e6daddb0fa214))
-   **bigquery:** add create job method ([#&#8203;32](https://www.github.com/googleapis/python-bigquery/issues/32)) ([2abdef8](https://www.github.com/googleapis/python-bigquery/commit/2abdef82bed31601d1ca1aa92a10fea1e09f5297))
-   **bigquery:** add support of model for extract job ([#&#8203;71](https://www.github.com/googleapis/python-bigquery/issues/71)) ([4a7a514](https://www.github.com/googleapis/python-bigquery/commit/4a7a514659a9f6f9bbd8af46bab3f8782d6b4b98))
-   add HOUR support for time partitioning interval ([#&#8203;91](https://www.github.com/googleapis/python-bigquery/issues/91)) ([0dd90b9](https://www.github.com/googleapis/python-bigquery/commit/0dd90b90e3714c1d18f8a404917a9454870e338a))
-   add support for policy tags ([#&#8203;77](https://www.github.com/googleapis/python-bigquery/issues/77)) ([38a5c01](https://www.github.com/googleapis/python-bigquery/commit/38a5c01ca830daf165592357c45f2fb4016aad23))
-   make AccessEntry objects hashable ([#&#8203;93](https://www.github.com/googleapis/python-bigquery/issues/93)) ([23a173b](https://www.github.com/googleapis/python-bigquery/commit/23a173bc5a25c0c8200adc5af62eb05624c9099e))
-   **bigquery:** expose start index parameter for query result ([#&#8203;121](https://www.github.com/googleapis/python-bigquery/issues/121)) ([be86de3](https://www.github.com/googleapis/python-bigquery/commit/be86de330a3c3801653a0ccef90e3d9bdb3eee7a))
-   **bigquery:** unit and system test for dataframe with int column with Nan values  ([#&#8203;39](https://www.github.com/googleapis/python-bigquery/issues/39)) ([5fd840e](https://www.github.com/googleapis/python-bigquery/commit/5fd840e9d4c592c4f736f2fd4792c9670ba6795e))

##### Bug Fixes

-   allow partial streaming_buffer statistics ([#&#8203;37](https://www.github.com/googleapis/python-bigquery/issues/37)) ([645f0fd](https://www.github.com/googleapis/python-bigquery/commit/645f0fdb35ee0e81ee70f7459e796a42a1f03210))
-   distinguish server timeouts from transport timeouts ([#&#8203;43](https://www.github.com/googleapis/python-bigquery/issues/43)) ([a17be5f](https://www.github.com/googleapis/python-bigquery/commit/a17be5f01043f32d9fbfb2ddf456031ea9205c8f))
-   improve cell magic error message on missing query ([#&#8203;58](https://www.github.com/googleapis/python-bigquery/issues/58)) ([6182cf4](https://www.github.com/googleapis/python-bigquery/commit/6182cf48aef8f463bb96891cfc44a96768121dbc))
-   **bigquery:** fix repr of model reference ([#&#8203;66](https://www.github.com/googleapis/python-bigquery/issues/66)) ([26c6204](https://www.github.com/googleapis/python-bigquery/commit/26c62046f4ec8880cf6561cc90a8b821dcc84ec5))
-   **bigquery:** fix start index with page size for list rows ([#&#8203;27](https://www.github.com/googleapis/python-bigquery/issues/27)) ([400673b](https://www.github.com/googleapis/python-bigquery/commit/400673b5d0f2a6a3d828fdaad9d222ca967ffeff))

</details>

---

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samples/to_dataframe/requirements.txt

@@ -1,6 +1,6 @@
 google-auth==1.16.1
 google-cloud-bigquery-storage==1.0.0
-google-cloud-bigquery==1.24.0
+google-cloud-bigquery==1.25.0
 pyarrow==0.17.1
 ipython==7.10.2; python_version > '3.0'
 ipython==5.9.0; python_version < '3.0'