Bump pyyaml from 5.3.1 to 5.4

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]

requirements.txt

@@ -114,7 +114,7 @@ pyramid==1.10.2
     #   pyramid-chameleon
 python-dateutil==2.8.0
     # via strictyaml
-pyyaml==5.3.1
+pyyaml==5.4
     # via devpi-ldap
 readme-renderer[md]==24.0
     # via devpi-web