chore(deps): update dependency pytest to v6.2.4 (#135)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pytest](https://docs.pytest.org/en/latest/) ([source](https://togithub.com/pytest-dev/pytest), [changelog](https://docs.pytest.org/en/stable/changelog.html)) | `==6.2.3` -> `==6.2.4` | [![age](https://badges.renovateapi.com/packages/pypi/pytest/6.2.4/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/pytest/6.2.4/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/pytest/6.2.4/compatibility-slim/6.2.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/pytest/6.2.4/confidence-slim/6.2.3)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>pytest-dev/pytest</summary>

### [`v6.2.4`](https://togithub.com/pytest-dev/pytest/releases/6.2.4)

[Compare Source](https://togithub.com/pytest-dev/pytest/compare/6.2.3...6.2.4)

# pytest 6.2.4 (2021-05-04)

## Bug Fixes

-   [#&#8203;8539](https://togithub.com/pytest-dev/pytest/issues/8539): Fixed assertion rewriting on Python 3.10.

</details>

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monitoring/snippets/v3/alerts-client/requirements-test.txt

@@ -1,3 +1,3 @@
-pytest==6.2.3
+pytest==6.2.4
 retrying==1.3.3
 flaky==3.7.0

monitoring/snippets/v3/cloud-client/requirements-test.txt

@@ -1,3 +1,3 @@
 backoff==1.10.0
-pytest==6.2.3
+pytest==6.2.4
 mock==4.0.3

monitoring/snippets/v3/uptime-check-client/requirements-test.txt

@@ -1,2 +1,2 @@
 backoff==1.10.0
-pytest==6.2.3
+pytest==6.2.4