CONTRIBUTING.md references non-existent tests/requirements.yml

[tim80411]

/kind documentation

What happened?

The environment setup section in CONTRIBUTING.md includes:

ansible-galaxy install -r tests/requirements.yml

Running this fails because tests/requirements.yml no longer exists:

ERROR! The requirements file 'tests/requirements.yml' does not exist.

This file was intentionally removed in ef95eb0 ("Cleanup unused CI tooling", #11014), but CONTRIBUTING.md was not updated.

Why this line is no longer needed

requirements.txt specifies ansible==11.13.0, which already bundles all collections listed in galaxy.yml (ansible.utils, community.crypto, community.general, ansible.netcommon, ansible.posix, community.docker, kubernetes.core) with versions that satisfy all requirements.

Suggested fix

Remove the ansible-galaxy install -r tests/requirements.yml line from CONTRIBUTING.md.