fix: suggestions for 4.20 and above

Author: aamadeuss

variables.tf

@@ -107,9 +107,8 @@ variable "worker_pools" {
       (local.ocp_version_num == "4.14" && wp.operating_system == local.os_rhel) ||
       (local.ocp_version_num == "4.15" && contains([local.os_rhel, local.os_rhcos], wp.operating_system)) ||
       (contains(["4.16", "4.17"], local.ocp_version_num) && contains([local.os_rhel9, local.os_rhel, local.os_rhcos], wp.operating_system)) ||
-      (local.ocp_version_num == "4.18" && contains([local.os_rhel9, local.os_rhcos], wp.operating_system)) ||
-      (local.ocp_version_num == "4.19" && contains([local.os_rhel9, local.os_rhcos], wp.operating_system)) ||
-      (tonumber(local.ocp_version_num) > 4.19)
+      (contains(["4.18", "4.19", "4.20"], local.ocp_version_num) && contains([local.os_rhel9, local.os_rhcos], wp.operating_system)) ||
+      (tonumber(local.ocp_version_num) >= 4.21 && wp.operating_system == local.os_rhcos)
     ])
     error_message = "Invalid operating system for the given OCP version. Ensure the OS is compatible with the OCP version. Supported compatible OCP version and OS are v4.14: (REDHAT_8_64); v4.15: (REDHAT_8_64, RHCOS) ; v4.16 and v4.17: (REDHAT_8_64, RHCOS, RHEL_9_64); v4.18: (RHCOS, RHEL_9_64); v4.19: (RHEL_9_64, RHCOS)"
   }