chore(deps): update dependency grafeas to v0.4.1 [(#4200)](GoogleCloudPlatform/python-docs-samples#4200)

This PR contains the following updates:

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

---

### Release Notes

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

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

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

</details>

---

### Renovate configuration

:date: **Schedule**: At any time (no schedule defined).

:vertical_traffic_light: **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

:recycle: **Rebasing**: Never, or you tick the rebase/retry checkbox.

:no_bell: **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#GoogleCloudPlatform/python-docs-samples).

Author: renovate-bot

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