Fix pslam reported errors.

psalm.xml

@@ -144,6 +144,7 @@
 
         <InvalidArrayOffset>
             <errorLevel type="suppress">
+                <file name="src/Auth/BaseAuthenticate.php" />
                 <file name="src/Core/StaticConfigTrait.php" />
                 <file name="src/I18n/Parser/MoFileParser.php" />
                 <file name="src/I18n/Parser/PoFileParser.php" />

src/Collection/CollectionTrait.php

@@ -388,6 +388,7 @@ trait CollectionTrait
             if ($count === 0) {
                 return null;
             }
+            /** @var \Countable $iterator */
             $iterator = new LimitIterator($iterator, $count - 1, 1);
         }