Update minimum stdlib version to 9.0.0

This is due to stdlib functions such as shell_escape being rescoped to the stdlib namespace in stdlib 9.0.0

Author: Jory Osterptak

metadata.json

@@ -10,7 +10,7 @@
   "dependencies": [
     {
       "name": "puppetlabs/stdlib",
-      "version_requirement": ">= 8.5.0 < 10.0.0"
+      "version_requirement": ">= 9.0.0 < 10.0.0"
     },
     {
       "name": "puppetlabs/inifile",