⬆️ Update pytest requirement from ~=6.0 to ~=7.4

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@6.0.0...7.4.3)

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

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

pyproject.toml

@@ -38,7 +38,7 @@ Source = "https://github.com/aiidaplugins/aiida-lammps"
 [project.optional-dependencies]
 tests = [
     'pgtest~=1.3',
-    'pytest~=6.0',
+    'pytest~=7.4',
     'pytest-regressions~=2.3',
     "pytest-cov",
     "coverage",