Fix masterminds-html5 lib php8-1 notice return type use phpstan

src/HTML5/Parser/StringInputStream.php

@@ -177,6 +177,7 @@ public function getColumnOffset()
      *
      * @return string The current character.
      */
+    #[\ReturnTypeWillChange]
     public function current()
     {
         return $this->data[$this->char];
@@ -186,6 +187,7 @@ public function current()
      * Advance the pointer.
      * This is part of the Iterator interface.
      */
+    #[\ReturnTypeWillChange]
     public function next()
     {
         $this->char ++;
@@ -194,6 +196,7 @@ public function next()
     /**
      * Rewind to the start of the string.
      */
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         $this->char = 0;
@@ -204,6 +207,7 @@ public function rewind()
      *
      * @return bool Is the current pointer location valid.
      */
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         if ($this->char < $this->EOF) {
@@ -324,6 +328,7 @@ public function peek()
         return false;
     }
 
+    #[\ReturnTypeWillChange]
     public function key()
     {
         return $this->char;