updates pgo_client download url
---
-pgo_client_url: "https://github.com/CrunchyData/postgres-operator/releases/download/{{ pgo_client_version }}"
+pgo_client_url: "https://github.com/CrunchyData/postgres-operator/releases/download/v{{ pgo_client_version }}"
pgo_keys_dir: "{{ ansible_env.HOME }}/.pgo/{{ pgo_operator_namespace }}"
