minor #26625 [Process] Remove a useless cast (dunglas)

This PR was merged into the 4.0 branch.

Discussion
----------

[Process] Remove a useless cast

| Q             | A
| ------------- | ---
| Branch?       | 4.0
| Bug fix?      | no
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | n/a   <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | n/a

Remove a useless cast (because of the typehint)

Commits
-------

2d5ce0dd2a [Process] Remove a useless cast

src/Symfony/Component/Process/Process.php

@@ -1441,7 +1441,7 @@ class Process implements \IteratorAggregate
             }
         }
 
-        $this->latestSignal = (int) $signal;
+        $this->latestSignal = $signal;
         $this->fallbackStatus['signaled'] = true;
         $this->fallbackStatus['exitcode'] = -1;
         $this->fallbackStatus['termsig'] = $this->latestSignal;