Bump cfbs from 5.3.0 to 5.5.1 in /packaging/cfengine-nova-hub

Bumps [cfbs](https://github.com/cfengine/cfbs) from 5.3.0 to 5.5.1.
- [Release notes](https://github.com/cfengine/cfbs/releases)
- [Commits](cfengine/cfbs@5.3.0...5.5.1)

---
updated-dependencies:
- dependency-name: cfbs
  dependency-version: 5.5.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

packaging/cfengine-nova-hub/requirements.txt

@@ -1 +1 @@
-cfbs==5.3.0
+cfbs==5.5.1