Update pytest-cov requirement from <=6.0.0,>=2.6.0 to >=2.6.0,<=6.1.1

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@v2.6.0...v6.1.1)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-version: 6.1.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]

devtools/dev-requirements.txt

@@ -30,7 +30,7 @@ pre-commit <= 4.2.0
 nbmake <= 1.5.5
 pytest ~= 8.3
 pytest-benchmark <= 5.1.0
-pytest-cov >= 2.6.0, <= 6.0.0
+pytest-cov >= 2.6.0, <= 6.1.1
 pytest-monitor <= 1.6.6
 pytest-mpl == 0.16.1
 pytest-split >= 0.8.2, <= 0.10.0