fix: update postgresql dependency in metadata

Author: teluq-pbrideau

metadata.json

@@ -6,7 +6,7 @@
   "dependencies": [
     {
       "name": "puppetlabs/postgresql",
-      "version_requirement": ">= 6.4.0 < 8.0.0"
+      "version_requirement": ">= 6.4.0 < 9.0.0"
     },
     {
       "name": "puppetlabs/stdlib",