Update dependency ipython to v7.16.1 [(#4189)](GoogleCloudPlatform/python-docs-samples#4189)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [ipython](https://ipython.org) ([source](https://togithub.com/ipython/ipython)) | minor | `==7.15.0` -> `==7.16.1` |

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### Release Notes

<details>
<summary>ipython/ipython</summary>

### [`v7.16.1`](https://togithub.com/ipython/ipython/compare/7.16.0...7.16.1)

[Compare Source](https://togithub.com/ipython/ipython/compare/7.16.0...7.16.1)

### [`v7.16.0`](https://togithub.com/ipython/ipython/compare/7.15.0...7.16.0)

[Compare Source](https://togithub.com/ipython/ipython/compare/7.15.0...7.16.0)

</details>

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samples/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-bigquery[pandas]==1.25.0
 google-auth-oauthlib==0.4.1
-ipython==7.15.0
+ipython==7.16.1
 matplotlib==3.2.2
 pytz==2020.1