refactor: fix latest phpstan errors

Author: paulbalandan

system/Model.php

@@ -146,9 +146,7 @@ class Model extends BaseModel
 
     public function __construct(?ConnectionInterface $db = null, ?ValidationInterface $validation = null)
     {
-        /**
-         * @var BaseConnection|null $db
-         */
+        /** @var BaseConnection $db */
         $db ??= Database::connect($this->DBGroup);
 
         $this->db = $db;

utils/phpstan-baseline/loader.neon

@@ -1,4 +1,4 @@
-# total 2116 errors
+# total 2117 errors
 
 includes:
     - argument.type.neon

utils/phpstan-baseline/return.type.neon

@@ -1,7 +1,12 @@
-# total 1 error
+# total 2 errors
 
 parameters:
     ignoreErrors:
+        -
+            message: '#^Method CodeIgniter\\Database\\BaseBuilder\:\:cleanClone\(\) should return \$this\(CodeIgniter\\Database\\BaseBuilder\) but returns static\(CodeIgniter\\Database\\BaseBuilder\)\.$#'
+            count: 1
+            path: ../../system/Database/BaseBuilder.php
+
         -
             message: '#^Method CodeIgniter\\Router\\Router\:\:getRouteAttributes\(\) should return array\{class\: list\<string\>, method\: list\<string\>\} but returns array\{class\: list\<CodeIgniter\\Router\\Attributes\\RouteAttributeInterface\>, method\: list\<CodeIgniter\\Router\\Attributes\\RouteAttributeInterface\>\}\.$#'
             count: 1