Bump pyyaml in /build-s2i-python-kopf/examples/kopf-simple (#540)

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)

---
updated-dependencies:
- dependency-name: pyyaml
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build-s2i-python-kopf/examples/kopf-simple/requirements.txt

@@ -1 +1 @@
-pyYAML==5.3.1
+pyYAML==5.4