Update pytest requirement from ~=7.1 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@7.1.0...8.1.0)

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

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

pyproject.toml

@@ -23,7 +23,7 @@ exclude = ["tests*"]
 
 [project.optional-dependencies]
 dev = [
-    "pytest~=7.1",
+    "pytest~=8.1",
     "python-dotenv~=1.0",
     "pytest-cov",
     "tox",