chore(deps): update dependency grafeas to v1.0.1 (#40)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [grafeas](https://togithub.com/googleapis/python-grafeas) | patch | `==1.0.0` -> `==1.0.1` |

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### Release Notes

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

### [`v1.0.1`](https://togithub.com/googleapis/python-grafeas/blob/master/CHANGELOG.md#&#8203;101-httpswwwgithubcomgoogleapispython-grafeascomparev100v101-2020-08-12)

[Compare Source](https://togithub.com/googleapis/python-grafeas/compare/v1.0.0...v1.0.1)

</details>

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

@@ -1,6 +1,6 @@
 google-cloud-pubsub==1.7.0
 google-cloud-containeranalysis==2.0.0
-grafeas==1.0.0
+grafeas==1.0.1
 pytest==5.3.0; python_version > "3.0"
 pytest==4.6.6; python_version < "3.0"
 flaky==3.7.0