Update pytest-cov requirement in /.dev in the python group (#706)

Updates the requirements on [pytest-cov](https://github.com/pytest-dev/pytest-cov) to permit the latest version.

Updates `pytest-cov` to 7.1.0
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v7.0.0...v7.1.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-version: 7.1.0
  dependency-type: direct:development
  dependency-group: python
...

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Author: dependabot[bot]

.dev/requirements_dev.txt

@@ -4,7 +4,7 @@ httpx~=0.28.1
 invoke~=2.2
 pre-commit~=4.5
 pytest~=9.0
-pytest-cov~=7.0
+pytest-cov~=7.1
 
 # httpx is necessary due to the use of fastapi/starlette's TestClient
 # See https://fastapi.tiangolo.com/tutorial/testing/?h=testclient#using-testclient