Issue #3364313 by hlopez, ptmkenny: Fixed a few PHP 8.1 deprecations.

src/File/LineIterator.php

@@ -33,7 +33,7 @@ class LineIterator extends SplFileObject {
   /**
    * Implements Iterator::rewind().
    */
-  public function rewind() {
+  public function rewind(): void {
     parent::rewind();
     if ($this->startPosition) {
       $this->fseek($this->startPosition);
@@ -44,7 +44,7 @@ class LineIterator extends SplFileObject {
   /**
    * Implements Iterator::next().
    */
-  public function next() {
+  public function next(): void {
     $this->linesRead++;
     parent::next();
   }
@@ -52,7 +52,7 @@ class LineIterator extends SplFileObject {
   /**
    * Implements Iterator::valid().
    */
-  public function valid() {
+  public function valid(): bool {
     return (!$this->lineLimit || $this->linesRead < $this->lineLimit) && parent::valid() && parent::current();
   }