chore(deps): update dependency google-cloud-storage to v1.40.0 (#219)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-storage](https://togithub.com/googleapis/python-storage) | `==1.39.0` -> `==1.40.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-storage/1.40.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-storage/1.40.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-storage/1.40.0/compatibility-slim/1.39.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-storage/1.40.0/confidence-slim/1.39.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.40.0`](https://togithub.com/googleapis/python-storage/blob/master/CHANGELOG.md#&#8203;1400-httpswwwgithubcomgoogleapispython-storagecomparev1390v1400-2021-06-30)

[Compare Source](https://togithub.com/googleapis/python-storage/compare/v1.39.0...v1.40.0)

##### Features

-   add preconditions and retry configuration to blob.create_resumable_upload_session ([#&#8203;484](https://www.github.com/googleapis/python-storage/issues/484)) ([0ae35ee](https://www.github.com/googleapis/python-storage/commit/0ae35eef0fe82fe60bc095c4b183102bb1dabeeb))
-   add public access prevention to bucket IAM configuration ([#&#8203;304](https://www.github.com/googleapis/python-storage/issues/304)) ([e3e57a9](https://www.github.com/googleapis/python-storage/commit/e3e57a9c779d6b87852063787f19e27c76b1bb14))

##### Bug Fixes

-   replace default retry for upload operations ([#&#8203;480](https://www.github.com/googleapis/python-storage/issues/480)) ([c027ccf](https://www.github.com/googleapis/python-storage/commit/c027ccf4279fb05e041754294f10744b7d81beea))

</details>

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samples/snippets/requirements.txt

@@ -1,4 +1,4 @@
-google-cloud-storage==1.39.0
+google-cloud-storage==1.40.0
 google-cloud-asset==3.1.0
 google-cloud-resource-manager==0.30.3
 google-cloud-pubsub==2.6.0