Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.3 to 5.4.
Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.3 to 5.4.

Change-Id: I7b6427c3f1772122e836d6d2112c7fca0b75b500

google/shopping-markup,google/shopping-markup