chore: use predefined ConverterRegistry phpstan type

Co-authored-by: Simon Podlipsky <[email protected]>

Author: filecage

src/Param/ParamValueConverterRegistry.php

@@ -72,7 +72,7 @@ public function __construct(array $registry = [])
             ));
         };
 
-        /** @phpstan-var array<string, Converter> $defaultRegistry */
+        /** @phpstan-var ConverterRegistry $defaultRegistry */
         $defaultRegistry = [
             'String' => self::stringConverter(),
             'FixedString' => self::stringConverter(),