PMM-7: Fix valkey

Author: peterSirotnak

pmm_qa/valkey/valkey-cluster.yml

@@ -8,7 +8,7 @@
     client_version: "{{ lookup('vars', 'extra_client_version', default=lookup('env','CLIENT_VERSION') | default('3-dev-latest', true) ) }}"
     admin_password: "{{ lookup('vars', 'extra_admin_password', default=lookup('env','ADMIN_PASSWORD') | default('admin', true) ) }}"
     valkey_version: "{{ lookup('env', 'VALKEY_VERSION') | default('7', true) }}"
-    valkey_image: "valkey/valkey:{{ valkey_version }}"
+    valkey_image: "valkey/valkey:{{ valkey_version }}-bookworm"
     valkey_network_name: "pmm-qa"
     valkey_password: "VKvl41568AsE"
     valkey_cluster_node_count: 6 # total nodes