Update ansible-core requirement from <2.16.3 to <2.16.6

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@0.0.1...v2.16.5)

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

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

requirements.txt

@@ -21,7 +21,7 @@ ansible>=8,<10
 # tasks, etc. for any Ansible role installed via ansible-galaxy.
 #
 # See also cisagov/skeleton-ansible-role#178.
-ansible-core<2.16.3
+ansible-core<2.16.6
 boto3
 docopt
 semver