Define requirements_file argument, remove useless path argument

Ref: https://ansible.readthedocs.io/projects/lint/installing/#installing-ansible-lint-as-a-github-action

.github/workflows/matrix.yml

@@ -23,4 +23,4 @@ jobs:
       - name: Run ansible-lint
         uses: ansible/ansible-lint@v24.10.0
         with:
-          path: roles/custom
+          requirements_file: requirements.yml