Update pyyaml requirement in /sdks/python

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/main/CHANGES)
- [Commits](yaml/pyyaml@3.12...5.4.1)

---
updated-dependencies:
- dependency-name: pyyaml
  dependency-version: 5.4.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]

sdks/python/pyproject.toml

@@ -35,7 +35,7 @@ requires = [
     "cython>=3.0,<4",
     ## deps for generating external transform wrappers:
     # also update PyYaml bounds in sdks:python:generateExternalTransformsConfig
-    'pyyaml>=3.12,<7.0.0',
+    'pyyaml>=5.4.1,<7.0.0',
     # also update Jinja2 bounds in test-suites/xlang/build.gradle (look for xlangWrapperValidation task)
     "jinja2>=2.7.1,<4.0.0",
     'yapf==0.43.0'