[11.x] Uri and UriQueryString implement Stringable (#53873)

* Update UriQueryString.php * Update Uri.php

Author: cosmastech

src/Illuminate/Support/Uri.php

@@ -14,7 +14,7 @@
 use SensitiveParameter;
 use Stringable;
 
-class Uri implements Htmlable, Responsable
+class Uri implements Htmlable, Responsable, Stringable
 {
  use Conditionable, Tappable;
 

src/Illuminate/Support/UriQueryString.php

@@ -5,8 +5,9 @@
 use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Support\Traits\InteractsWithData;
 use League\Uri\QueryString;
+use Stringable;
 
-class UriQueryString implements Arrayable
+class UriQueryString implements Arrayable, Stringable
 {
  use InteractsWithData;