Update pytest requirement from ~=7.4 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@7.4.0...8.1.0)

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

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

dic2owl/requirements_dev.txt

@@ -2,5 +2,5 @@ pre-commit~=2.21; python_version<"3.8"
 pre-commit~=3.5; python_version>="3.8"
 pylint>=2.13.9,<3; python_version<"3.8"
 pylint~=3.0; python_version>="3.8"
-pytest~=7.4
+pytest~=8.1
 pytest-cov~=4.1