chore(deps): update terraform juju to ~> 0.23

Author: renovate[bot]

terraform/providers.tf

@@ -2,7 +2,7 @@ terraform {
   required_providers {
     juju = {
       source  = "juju/juju"
-      version = "~> 0.15"
+      version = "~> 0.23"
     }
   }
 }