build(deps): bump pyyaml from 5.3.1 to 5.4 in /chromium

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.3.1 to 5.4.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](yaml/pyyaml@5.3.1...5.4)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

chromium/requirements.txt

@@ -73,7 +73,7 @@ python-dateutil==2.8.1
 python-gnupg==0.4.6
 python-ldap==3.3.0
 pytz==2020.4
-PyYAML==5.3.1
+PyYAML==5.4
 requests==2.25.0
 requests-aws4auth==1.0.1
 s3transfer==0.3.3