Update pytest requirement from ==6.2.* to ==8.1.*

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@6.2.0.dev0...8.1.1)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements-test.txt

@@ -3,7 +3,7 @@ flake8==4.0.*
 freezegun==1.1.*
 isort==5.10.*
 mypy==0.931
-pytest==6.2.*
+pytest==8.1.*
 pytest-cov==3.0.*
 pytest-vcr==1.0.*
 requests-mock==1.9.*