chore(deps): update dependency google-cloud-secret-manager to v2.6.0 (#145)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-secret-manager](https://togithub.com/googleapis/python-secret-manager) | `==2.5.0` -> `==2.6.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-secret-manager/2.6.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-secret-manager/2.6.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-secret-manager/2.6.0/compatibility-slim/2.5.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-secret-manager/2.6.0/confidence-slim/2.5.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.6.0`](https://togithub.com/googleapis/python-secret-manager/blob/master/CHANGELOG.md#&#8203;260-httpswwwgithubcomgoogleapispython-secret-managercomparev250v260-2021-07-09)

[Compare Source](https://togithub.com/googleapis/python-secret-manager/compare/v2.5.0...v2.6.0)

##### Features

-   add always_use_jwt_access ([#&#8203;137](https://www.github.com/googleapis/python-secret-manager/issues/137)) ([e1ee4c7](https://www.github.com/googleapis/python-secret-manager/commit/e1ee4c76ba5eb12b3fdd54eed1b2498eac386030))
-   Tune Secret Manager auto retry parameters ([#&#8203;144](https://www.github.com/googleapis/python-secret-manager/issues/144)) ([494f3f6](https://www.github.com/googleapis/python-secret-manager/commit/494f3f638203fd683e36bdf882d8a29b9b303dc5))

##### Bug Fixes

-   disable always_use_jwt_access ([#&#8203;143](https://www.github.com/googleapis/python-secret-manager/issues/143)) ([47cdda9](https://www.github.com/googleapis/python-secret-manager/commit/47cdda91a0962805f8553ec9f2ac779d99c3e291))

##### Documentation

-   omit mention of Python 2.7 in 'CONTRIBUTING.rst' ([#&#8203;1127](https://www.github.com/googleapis/python-secret-manager/issues/1127)) ([#&#8203;132](https://www.github.com/googleapis/python-secret-manager/issues/132)) ([6a10592](https://www.github.com/googleapis/python-secret-manager/commit/6a105926ec39939398deca5b6fbfb05290615bfd)), closes [#&#8203;1126](https://www.github.com/googleapis/python-secret-manager/issues/1126)

</details>

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Author: renovate-bot

secretmanager/snippets/requirements.txt

@@ -1 +1 @@
-google-cloud-secret-manager==2.5.0
+google-cloud-secret-manager==2.6.0