Log Message:
py-yaml: updated to 5.4.1

5.4.1
* Fix stub compat with older pyyaml versions that may unwittingly load it

5.4
* Build modernization, remove distutils, fix metadata, build wheels, CI to GHA
* Fix for CVE-2020-14343, moves arbitrary python tags to UnsafeLoader
* Fix memory leak in implicit resolver setup
* Fix py2 copy support for timezone objects
* Fix compatibility with Jython