(SUP-3952) Update metadate to puppet 7

Author: Elaine McCloskey

metadata.json

@@ -56,7 +56,7 @@
   "requirements": [
     {
       "name": "puppet",
-      "version_requirement": ">= 6.16.0 < 8.0.0"
+      "version_requirement": ">= 7.18.0 < 8.0.0"
     }
   ],
   "pdk-version": "2.4.0",