chore(deps): update pytest-cov requirement from <8,>=2 to >=7.1.0,<8

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@v2.0.0...v7.1.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-version: 7.1.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements/testing.txt

@@ -4,7 +4,7 @@ aiohttp<3.11; python_version == "3.8"  # used for a WebSocket server mock
 aiohttp<4; python_version >= "3.9"  # used for a WebSocket server mock
 pytest>=7.0.1,<9
 pytest-asyncio<2  # for async
-pytest-cov>=2,<8
+pytest-cov>=7.1.0,<8
 click==8.0.4  # black is affected by https://github.com/pallets/click/issues/2225
 psutil>=6.0.0,<8
 # cryptography 46+ dropped PyPy 3.10 wheels; pin to <46 for PyPy 3.10 only