Update pytest-cov requirement from <6,>=5 to >=5,<7 (#60)

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@v5.0.0...v6.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Oleg A. <t0rr@mail.ru>

pyproject.toml

@@ -65,7 +65,7 @@ test = [
     "pytest>=8,<9",
     "pytest-asyncio>=0,<1",
     "pytest-aiohttp>=1.0,<2",
-    "pytest-cov>=5,<6",
+    "pytest-cov>=5,<7",
     "aresponses>=3,<4",
     "fastapi-slim>=0.111,<1",
     "httpx>=0.27,<1",