chore(deps): update dependency pytest-xdist to v2.3.0 (#6234)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pytest-xdist](https://togithub.com/pytest-dev/pytest-xdist) | `==2.2.1` -> `==2.3.0` | [![age](https://badges.renovateapi.com/packages/pypi/pytest-xdist/2.3.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/pytest-xdist/2.3.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/pytest-xdist/2.3.0/compatibility-slim/2.2.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/pytest-xdist/2.3.0/confidence-slim/2.2.1)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v2.3.0`](https://togithub.com/pytest-dev/pytest-xdist/blob/master/CHANGELOG.rst#pytest-xdist-230-2021-06-16)

[Compare Source](https://togithub.com/pytest-dev/pytest-xdist/compare/v2.2.1...v2.3.0)

\===============================

## Deprecations and Removals

-   `#&#8203;654 <https://github.com/pytest-dev/pytest-xdist/issues/654>`\_: Python 3.5 is no longer supported.

## Features

-   `#&#8203;646 <https://github.com/pytest-dev/pytest-xdist/issues/646>`\_: Add `--numprocesses=logical` flag, which automatically uses the number of logical CPUs available, instead of physical CPUs with `auto`.

    This is very useful for test suites which are not CPU-bound.

-   `#&#8203;650 <https://github.com/pytest-dev/pytest-xdist/issues/650>`\_: Added new `pytest_handlecrashitem` hook to allow handling and rescheduling crashed items.

## Bug Fixes

-   `#&#8203;421 <https://github.com/pytest-dev/pytest-xdist/issues/421>`\_: Copy the parent process sys.path into local workers, to work around execnet's python -c adding the current directory to sys.path.

-   `#&#8203;638 <https://github.com/pytest-dev/pytest-xdist/issues/638>`\_: Fix issue caused by changing the branch name of the pytest repository.

## Trivial Changes

-   `#&#8203;592 <https://github.com/pytest-dev/pytest-xdist/issues/592>`\_: Replace master with controller where ever possible.

-   `#&#8203;643 <https://github.com/pytest-dev/pytest-xdist/issues/643>`\_: Use 'main' to refer to pytest default branch in tox env names.

</details>

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dataflow/flex-templates/streaming_beam/requirements-test.txt

@@ -1,5 +1,5 @@
 google-api-python-client==2.11.0
 google-cloud-storage==1.38.0
-pytest-xdist==2.2.1
+pytest-xdist==2.3.0
 pytest==6.2.4
 pyyaml==5.4.1