Bump pyyaml from 5.3.1 to 5.4.1

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.3.1 to 5.4.1.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](https://github.com/yaml/pyyaml/compare/5.3.1...5.4.1)

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

requirements.txt

@@ -7,6 +7,6 @@ jinja2==2.11.3
 lxml==4.6.2
 pygments==2.1.3
 python-dateutil==2.8.1
-pyyaml==5.3.1
+pyyaml==5.4.1
 requests[socks]==2.25.1
 langdetect==1.0.8