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` |

---

### 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>

---

### 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).

secretmanager/api-client/requirements.txt

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