chore(deps): update dependency google-cloud-tasks to v2.4.0 (#127)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-tasks](https://github.com/googleapis/python-tasks) | `==2.3.0` -> `==2.4.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-tasks/2.4.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-tasks/2.4.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-tasks/2.4.0/compatibility-slim/2.3.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-tasks/2.4.0/confidence-slim/2.3.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.4.0`](https://github.com/googleapis/python-tasks/blob/master/CHANGELOG.md#&#8203;240-httpswwwgithubcomgoogleapispython-taskscomparev230v240-2021-07-01)

[Compare Source](https://github.com/googleapis/python-tasks/compare/v2.3.0...v2.4.0)

##### Features

-   add always_use_jwt_access ([#&#8203;122](https://www.github.com/googleapis/python-tasks/issues/122)) ([87c9ccc](https://www.github.com/googleapis/python-tasks/commit/87c9cccb42237eb421c72411652985a7fbe1c16a))

##### Bug Fixes

-   disable always_use_jwt_access ([#&#8203;126](https://www.github.com/googleapis/python-tasks/issues/126)) ([54d2286](https://www.github.com/googleapis/python-tasks/commit/54d2286b153c36b7a50b5a936517aa59e10ad27c))
-   update sample for task name ([#&#8203;120](https://www.github.com/googleapis/python-tasks/issues/120)) ([b1be2de](https://www.github.com/googleapis/python-tasks/commit/b1be2de174fc37d0eb90bbf877851c11ddb14907))

##### Documentation

-   omit mention of Python 2.7 in CONTRIBUTING.rst ([#&#8203;116](https://www.github.com/googleapis/python-tasks/issues/116)) ([0732ab7](https://www.github.com/googleapis/python-tasks/commit/0732ab7d726fdf564897fad009f8a5da45b5c017)), closes [#&#8203;1126](https://www.github.com/googleapis/python-tasks/issues/1126)

</details>

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cloud-tasks/snippets/requirements.txt

@@ -1 +1 @@
-google-cloud-tasks==2.3.0
+google-cloud-tasks==2.4.0