chore(deps): update dependency google-cloud-tasks to v2.5.0 (#140)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-tasks](https://togithub.com/googleapis/python-tasks) | `==2.4.0` -> `==2.5.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-tasks/2.5.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-tasks/2.5.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-tasks/2.5.0/compatibility-slim/2.4.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-tasks/2.5.0/confidence-slim/2.4.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.5.0`](https://togithub.com/googleapis/python-tasks/blob/master/CHANGELOG.md#&#8203;250-httpswwwgithubcomgoogleapispython-taskscomparev240v250-2021-07-21)

[Compare Source](https://togithub.com/googleapis/python-tasks/compare/v2.4.0...v2.5.0)

##### Features

-   Set `audience` field in authenticated HTTP task example ([#&#8203;138](https://www.github.com/googleapis/python-tasks/issues/138)) ([7a5a0c6](https://www.github.com/googleapis/python-tasks/commit/7a5a0c6ca5372035521d5366373054a7ba95f2bd))

##### Bug Fixes

-   **deps:** pin 'google-{api,cloud}-core', 'google-auth' to allow 2.x versions ([#&#8203;134](https://www.github.com/googleapis/python-tasks/issues/134)) ([fd3cb31](https://www.github.com/googleapis/python-tasks/commit/fd3cb31bc1d36e5b6373bfa3d3bb9bb65aeb3f90))

</details>

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cloud-tasks/snippets/requirements.txt

@@ -1 +1 @@
-google-cloud-tasks==2.4.0
+google-cloud-tasks==2.5.0