minor #48793 Leverage arrow function syntax for closure (tigitz)

This PR was merged into the 6.3 branch.

Discussion
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Leverage arrow function syntax for closure

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Fix #47658 <!-- prefix each issue number with "Fix #", no need to create an issue if none exists, explain below instead -->
| License       | MIT
| Doc PR        | <!-- required for new features -->

Rationale in the RFC [here](https://wiki.php.net/rfc/arrow_functions_v2#introduction)

It's also notable that using arrow function syntax rather than the classic one has been enforced in the past by symfony core member: symfony/symfony#48069 (comment)

So this PR would be consistent.

Commits
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f5802d3a2a Leverage arrow function syntax for closure

Author: nicolas-grekas

OptionsResolver.php

@@ -1018,9 +1018,7 @@ public function offsetGet(mixed $option, bool $triggerDeprecation = true): mixed
                 $fmtActualValue = $this->formatValue($value);
                 $fmtAllowedTypes = implode('" or "', $this->allowedTypes[$option]);
                 $fmtProvidedTypes = implode('|', array_keys($invalidTypes));
-                $allowedContainsArrayType = \count(array_filter($this->allowedTypes[$option], static function ($item) {
-                    return str_ends_with($item, '[]');
-                })) > 0;
+                $allowedContainsArrayType = \count(array_filter($this->allowedTypes[$option], static fn ($item) => str_ends_with($item, '[]'))) > 0;
 
                 if (\is_array($value) && $allowedContainsArrayType) {
                     throw new InvalidOptionsException(sprintf('The option "%s" with value %s is expected to be of type "%s", but one of the elements is of type "%s".', $this->formatOptions([$option]), $fmtActualValue, $fmtAllowedTypes, $fmtProvidedTypes));
@@ -1281,9 +1279,7 @@ private function formatOptions(array $options): string
                 $prefix .= sprintf('[%s]', $this->prototypeIndex);
             }
 
-            $options = array_map(static function (string $option) use ($prefix): string {
-                return sprintf('%s[%s]', $prefix, $option);
-            }, $options);
+            $options = array_map(static fn (string $option): string => sprintf('%s[%s]', $prefix, $option), $options);
         }
 
         return implode('", "', $options);