chore(deps): update dependency google-cloud-secret-manager to v1 (#3846)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-secret-manager](https://togithub.com/googleapis/python-secret-manager) | major | `==0.2.0` -> `==1.0.0` |

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### Release Notes

<details>
<summary>googleapis/python-secret-manager</summary>

### [`v1.0.0`](https://togithub.com/googleapis/python-secret-manager/blob/master/CHANGELOG.md#&#8203;100-httpswwwgithubcomgoogleapispython-secret-managercomparev020v100-2020-05-20)

[Compare Source](https://togithub.com/googleapis/python-secret-manager/compare/v0.2.0...v1.0.0)

##### Features

-   release as production/stable ([#&#8203;24](https://www.github.com/googleapis/python-secret-manager/issues/24)) ([39a8cc8](https://www.github.com/googleapis/python-secret-manager/commit/39a8cc8f631569c82d1cbffc6a9bbb440d380683))

</details>

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secretmanager/api-client/requirements.txt

@@ -1 +1 @@
-google-cloud-secret-manager==0.2.0
+google-cloud-secret-manager==1.0.0