Moved minimum php version to 8.1

All PostgreSQL calls are now Connection/Resource object types and not
resource
All methods have parameter type set

.phan/config.php

@@ -27,6 +27,7 @@ use Phan\Config;
 
 return [
 	// "target_php_version" => "8.2",
+	"minimum_target_php_version" => "8.1",
 	// turn color on (-C)
 	"color_issue_messages_if_supported" => true,
 	// If true, missing properties will be created when