Bump pytest from 7.3.2 to 9.0.3 in /.ci/docker

Bumps [pytest](https://github.com/pytest-dev/pytest) from 7.3.2 to 9.0.3.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.3.2...9.0.3)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.0.3
  dependency-type: direct:development
...

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

Author: dependabot[bot]

.ci/docker/requirements-dev.txt

@@ -1,5 +1,5 @@
 expecttest>=0.2.0
-pytest==7.3.2
+pytest==9.0.3
 pytest-cov
 pre-commit
 pyrefly==0.45.1