chore(deps): update dependency grafeas to v0.4.1 [(#4200)](GoogleClou…

…dPlatform/python-docs-samples#4200)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [grafeas](https://github.com/googleapis/python-grafeas) | patch | `==0.4.0` -> `==0.4.1` |

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### Release Notes

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

### [`v0.4.1`](https://github.com/googleapis/python-grafeas/blob/master/CHANGELOG.md#&#8203;041-httpswwwgithubcomgoogleapispython-grafeascomparev040v041-2020-06-25)

[Compare Source](https://github.com/googleapis/python-grafeas/compare/v0.4.0...v0.4.1)

</details>

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packages/google-cloud-containeranalysis/samples/snippets/requirements.txt

@@ -1,6 +1,6 @@
 google-cloud-pubsub==1.6.0
 google-cloud-containeranalysis==0.3.1
-grafeas==0.4.0
+grafeas==0.4.1
 pytest==5.3.0; python_version > "3.0"
 pytest==4.6.6; python_version < "3.0"
 flaky==3.6.1