Update pytest requirement from ~=7.4 to ~=8.1 (#74)

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@7.4.0...8.1.0)

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

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

Author: dependabot[bot]

requirements_test_min.txt

@@ -1,6 +1,6 @@
 -e .[testutils,spelling]
 astroid
 typing-extensions~=4.9
-pytest~=7.4
+pytest~=8.1
 pytest-benchmark~=4.0
 pytest-timeout~=2.2