Add $buildDir to CachePoolClearerCacheWarmer::warmUp()

Symfony 7 adds a new parameter `$buildDir` to
`WarmableInterface::warmUp()`, so that the method signature of
`CachePoolClearerCacheWarmer::warmUp()` needs to be updated.

src/Symfony/Bundle/CacheWarmer/CachePoolClearerCacheWarmer.php

@@ -34,7 +34,7 @@ public function __construct(private readonly Psr6CacheClearer $poolClearer, priv
      *
      * @return string[]
      */
-    public function warmUp(string $cacheDir): array
+    public function warmUp(string $cacheDir, string $buildDir = null): array
     {
         foreach ($this->pools as $pool) {
             if ($this->poolClearer->hasPool($pool)) {