Bump pytest from 7.2.1 to 7.3.1 (#360)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 7.2.1 to 7.3.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.2.1...7.3.1)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Sam Bull <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -3,7 +3,7 @@ build==0.10.0
 docutils==0.19
 mypy==1.2.0; implementation_name=="cpython"
 pre-commit==2.21.0
-pytest==7.2.1
+pytest==7.3.1
 pytest-asyncio==0.20.3
 pytest-cov==4.0.0
 twine==4.0.2