Update pytest requirement in /pipeline/seq_retrieval

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@8.0.0rc1...8.1.1)

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

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

pipeline/seq_retrieval/tests/requirements.txt

@@ -1,4 +1,4 @@
 flake8==7.0.*
 mypy==1.9.*
-pytest==8.0.*
+pytest==8.1.*
 pytest-cov==4.1.*