fix: widen parameter type to mixed to accept other Json serializables

Author: LuckyWindsck

src/MatchesSnapshots.php

@@ -89,7 +89,7 @@ public function assertMatchesHtmlSnapshot(string $actual): void
         $this->assertMatchesSnapshot($actual, new HtmlDriver);
     }
 
-    public function assertMatchesJsonSnapshot(array|string|null|int|float|bool $actual): void
+    public function assertMatchesJsonSnapshot($actual): void
     {
         $this->assertMatchesSnapshot($actual, new JsonDriver);
     }