minor #31606 [Finder] fix wrong method call casing (azjezz)

This PR was merged into the 3.4 branch.

Discussion
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[Finder] fix wrong method call casing

fix wrong method call casing for [`SplFileInfo::getRealPath()`](https://www.php.net/manual/en/splfileinfo.getrealpath.php)

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

Commits
-------

9b558fe [Finder] fix wrong method call casing

src/Symfony/Component/Finder/Iterator/SortableIterator.php

@@ -39,7 +39,7 @@ public function __construct(\Traversable $iterator, $sort)
 
         if (self::SORT_BY_NAME === $sort) {
             $this->sort = function ($a, $b) {
-                return strcmp($a->getRealpath() ?: $a->getPathname(), $b->getRealpath() ?: $b->getPathname());
+                return strcmp($a->getRealPath() ?: $a->getPathname(), $b->getRealPath() ?: $b->getPathname());
             };
         } elseif (self::SORT_BY_TYPE === $sort) {
             $this->sort = function ($a, $b) {
@@ -49,7 +49,7 @@ public function __construct(\Traversable $iterator, $sort)
                     return 1;
                 }
 
-                return strcmp($a->getRealpath() ?: $a->getPathname(), $b->getRealpath() ?: $b->getPathname());
+                return strcmp($a->getRealPath() ?: $a->getPathname(), $b->getRealPath() ?: $b->getPathname());
             };
         } elseif (self::SORT_BY_ACCESSED_TIME === $sort) {
             $this->sort = function ($a, $b) {