Update pytest-cov requirement in /pipeline/seq_retrieval

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@v4.1.0...v5.0.0)

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

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

pipeline/seq_retrieval/tests/requirements.txt

@@ -1,4 +1,4 @@
 flake8==7.0.*
 mypy==1.9.*
 pytest==8.0.*
-pytest-cov==4.1.*
+pytest-cov==5.0.*