minor symfony#53190 [Process] Suppress warnings from is_executable (bytestream)

This PR was merged into the 6.4 branch.

Discussion
----------

[Process] Suppress warnings from `is_executable`

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | symfony#52953
| License       | MIT

The code was recently changed in symfony/process@1f07ae6

Every other `is_executable()` call suppresses warnings. I believe it should here too. Otherwise it outputs:
```
is_executable(): open_basedir restriction in effect. File(/usr/bin/tar) is not within the allowed path(s): (/Users/bytestream)
```

Commits
-------

f72945f Suppress warnings from is_executable

Author: fabpot

src/Symfony/Component/Process/ExecutableFinder.php

@@ -73,7 +73,7 @@ public function find(string $name, string $default = null, array $extraDirs = []
         }
 
         $command = '\\' === \DIRECTORY_SEPARATOR ? 'where' : 'command -v';
-        if (\function_exists('exec') && ($executablePath = strtok(@exec($command.' '.escapeshellarg($name)), \PHP_EOL)) && is_executable($executablePath)) {
+        if (\function_exists('exec') && ($executablePath = strtok(@exec($command.' '.escapeshellarg($name)), \PHP_EOL)) && @is_executable($executablePath)) {
             return $executablePath;
         }