chore(deps): update ansible-core requirement

Updates the requirements on [ansible-core](https://github.com/ansible/ansible) to permit the latest version.
- [Release notes](https://github.com/ansible/ansible/releases)
- [Commits](ansible/ansible@v2.15.0...v2.16.5)

---
updated-dependencies:
- dependency-name: ansible-core
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,4 +1,4 @@
-ansible-core>=2.15,<2.16.5
+ansible-core>=2.15,<2.16.6
 graphviz>=0.18,<1
 colour<1
 lxml<6