minor #43903 Fix more generic types (derrabus)

This PR was merged into the 5.4 branch.

Discussion
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Fix more generic types

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | N/A
| License       | MIT
| Doc PR        | N/A

Some changes I wanted to push to #42471, but then it got merged already. 😇

Commits
-------

c54d61e9af Fix more generic types

Author: fabpot

ConstraintViolationList.php

@@ -21,16 +21,16 @@
 class ConstraintViolationList implements \IteratorAggregate, ConstraintViolationListInterface
 {
     /**
-     * @var ConstraintViolationInterface[]
+     * @var list<ConstraintViolationInterface>
      */
     private $violations = [];
 
     /**
      * Creates a new constraint violation list.
      *
-     * @param ConstraintViolationInterface[] $violations The constraint violations to add to the list
+     * @param iterable<mixed, ConstraintViolationInterface> $violations The constraint violations to add to the list
      */
-    public function __construct(array $violations = [])
+    public function __construct(iterable $violations = [])
     {
         foreach ($violations as $violation) {
             $this->add($violation);