chore(deps): update dependency google-cloud-storage to v1.39.0 (#335)

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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) | `==1.38.0` -> `==1.39.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-storage/1.39.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-storage/1.39.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-storage/1.39.0/compatibility-slim/1.38.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-storage/1.39.0/confidence-slim/1.38.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.39.0`](https://togithub.com/googleapis/python-storage/blob/master/CHANGELOG.md#&#8203;1390-httpswwwgithubcomgoogleapispython-storagecomparev1380v1390-2021-06-21)

[Compare Source](https://togithub.com/googleapis/python-storage/compare/v1.38.0...v1.39.0)

##### Features

-   media operation retries can be configured using the same interface as with non-media operation ([#&#8203;447](https://www.github.com/googleapis/python-storage/issues/447)) ([0dbbb8a](https://www.github.com/googleapis/python-storage/commit/0dbbb8ac17a4b632707485ee6c7cc15e4670efaa))

##### Bug Fixes

-   add ConnectionError to default retry ([#&#8203;445](https://www.github.com/googleapis/python-storage/issues/445)) ([8344253](https://www.github.com/googleapis/python-storage/commit/8344253a1969b9d04b81f87a6d7bddd3ddb55006))
-   apply idempotency policies for ACLs ([#&#8203;458](https://www.github.com/googleapis/python-storage/issues/458)) ([2232f38](https://www.github.com/googleapis/python-storage/commit/2232f38933dbdfeb4f6585291794d332771ffdf2))
-   replace python lifecycle action parsing ValueError with warning ([#&#8203;437](https://www.github.com/googleapis/python-storage/issues/437)) ([2532d50](https://www.github.com/googleapis/python-storage/commit/2532d506b44fc1ef0fa0a996822d29e7459c465a))
-   revise blob.compose query parameters `if_generation_match` ([#&#8203;454](https://www.github.com/googleapis/python-storage/issues/454)) ([70d19e7](https://www.github.com/googleapis/python-storage/commit/70d19e72831dee112bb07f38b50beef4890c1155))

##### Documentation

-   streamline 'timeout' / 'retry' docs in docstrings ([#&#8203;461](https://www.github.com/googleapis/python-storage/issues/461)) ([78b2eba](https://www.github.com/googleapis/python-storage/commit/78b2eba81003b437cd24f2b8d269ea2455682507))
-   streamline docstrings for conditional parmas ([#&#8203;464](https://www.github.com/googleapis/python-storage/issues/464)) ([6999370](https://www.github.com/googleapis/python-storage/commit/69993702390322df07cc2e818003186a47524c2b))

</details>

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samples/snippets/requirements.txt

@@ -1,4 +1,4 @@
 google-cloud-logging==2.5.0
 google-cloud-bigquery==2.20.0
-google-cloud-storage==1.38.0
+google-cloud-storage==1.39.0
 google-cloud-pubsub==2.5.0