(SIMP-9888) Ensure min stdlib is 6.6.0 (#79)

Author: op-ct

metadata.json

@@ -22,7 +22,7 @@
     },
     {
       "name": "puppetlabs/stdlib",
-      "version_requirement": ">= 6.18.0 < 8.0.0"
+      "version_requirement": ">= 6.6.0 < 8.0.0"
     },
     {
       "name": "puppetlabs/concat",