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

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] <support@github.com>

tests/setup.py

@@ -14,7 +14,7 @@
     include_package_data=True,
     install_requires=[
         'ducktape@git+https://github.com/vectorizedio/ducktape.git@6e2af9173a79feb8661c4c7a5776080721710a43',
-        'prometheus-client==0.9.0', 'pyyaml==5.3.1', 'kafka-python==2.0.2',
+        'prometheus-client==0.9.0', 'pyyaml==5.4', 'kafka-python==2.0.2',
         'crc32c==2.2', 'confluent-kafka==1.7.0', 'zstandard==0.15.2',
         'xxhash==2.0.2', 'protobuf==3.19.3', 'fastavro==1.4.9'
     ],