chore(deps): update pytest requirement from ~=7.4 to ~=8.1 (#192)

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>

requirements-testing.txt

@@ -1,6 +1,6 @@
 coverage[toml] ~= 7.4
 deadline-cloud-test-fixtures == 0.5.*
-pytest ~= 7.4
+pytest ~= 8.1
 pytest-cov == 4.1.*
 pytest-xdist == 3.5.*
 black[jupyter] ~= 23.12