chore(deps): update pyyaml requirement from <7.0,>=6.0 to >=6.0.3,<7.0

Updates the requirements on [pyyaml](https://github.com/yaml/pyyaml) to permit the latest version.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/6.0.3/CHANGES)
- [Commits](yaml/pyyaml@6.0...6.0.3)

---
updated-dependencies:
- dependency-name: pyyaml
  dependency-version: 6.0.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements-test.txt

@@ -2,7 +2,7 @@ pytest>=8.0,<9.0
 # PyYAML is required by the YAML-validating tests (test_release_doc_sync.py,
 # test_composite_action_shape.py). Without it those tests pytest.importorskip
 # and silently skip in CI, hiding real coverage.
-PyYAML>=6.0,<7.0
+PyYAML>=6.0.3,<7.0
 # Jinja2 is required by the born-green scaffold integration test, which renders
 # a repo of each type and runs the drift checker against the output.
 Jinja2>=3.1,<4.0