Update pytest-cov requirement from <6.0,>=3.0.0 to >=3.0.0,<7.0

Updates the requirements on [pytest-cov](https://github.com/pytest-dev/pytest-cov) to permit the latest version.
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v3.0.0...v6.0.0)

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

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

pyproject.toml

@@ -50,7 +50,7 @@ markdown = ["matplotlib"]
 tests = [
   "pytest>=7.2.0,<9.0",
   "pytest-sugar>=0.9.6,<2.0",
-  "pytest-cov>=3.0.0,<6.0",
+  "pytest-cov>=3.0.0,<7.0",
   "pytest-mock>=3.8.2,<4.0",
   "dvclive[image,plots,markdown]",
   "ipython",