Fix code for PHP8.1 (#617)

* Replace iterable with Traversable

Co-Authored-By: Jacob Baker-Kretzmar <18192441+bakerkretzmar@users.noreply.github.com>

* Add new Symfony command output to test snapshot expectations

Co-Authored-By: Jacob Baker-Kretzmar <18192441+bakerkretzmar@users.noreply.github.com>

* Update Composer dependencies

Co-Authored-By: Jacob Baker-Kretzmar <18192441+bakerkretzmar@users.noreply.github.com>

* Fix error reported by PHPStan

Co-authored-by: Matt Stauffer <matt@tighten.co>
Co-authored-by: Jacob Baker-Kretzmar <18192441+bakerkretzmar@users.noreply.github.com>

Author: 3 people

src/PhpParser/NodeVisitor/NamespaceStmt/NamespaceStmtCollection.php

@@ -21,6 +21,8 @@
 use PhpParser\Node;
 use PhpParser\Node\Name;
 use PhpParser\Node\Stmt\Namespace_;
+use Traversable;
+
 use function count;
 use function end;
 
@@ -105,7 +107,7 @@ private function getNodeNamespaceName(Node $node): ?Name
         return $this->getNodeNamespaceName($parentNode);
     }
 
-    public function getIterator(): iterable
+    public function getIterator(): Traversable
     {
         return new ArrayIterator($this->nodes);
     }

src/PhpParser/NodeVisitor/UseStmt/UseStmtCollection.php

@@ -28,6 +28,8 @@
 use PhpParser\Node\Stmt\Function_;
 use PhpParser\Node\Stmt\Use_;
 use PhpParser\Node\Stmt\UseUse;
+use Traversable;
+
 use function array_key_exists;
 use function count;
 use function implode;
@@ -108,9 +110,9 @@ public function findStatementForNode(?Name $namespaceName, Name $node): ?Name
     }
 
     /**
-     * @return iterable<string, list<Use_[]>>
+     * @return Traversable<string, list<Use_[]>>
      */
-    public function getIterator(): iterable
+    public function getIterator(): Traversable
     {
         return new ArrayIterator($this->nodes);
     }