Change ProxyCacheWarmer::warmUp signature

UPGRADE-6.4.md

@@ -96,6 +96,7 @@ DependencyInjection
 DoctrineBridge
 --------------
 
+ * [BC Break] Add argument `$buildDir` to `ProxyCacheWarmer::warmUp()` 
  * [BC Break] Add return type-hints to `EntityFactory`
  * Deprecate `DbalLogger`, use a middleware instead
  * Deprecate not constructing `DoctrineDataCollector` with an instance of `DebugDataHolder`

src/Symfony/Bridge/Doctrine/CHANGELOG.md

@@ -4,6 +4,7 @@ CHANGELOG
 6.4
 ---
 
+ * [BC BREAK] Add argument `$buildDir` to `ProxyCacheWarmer::warmUp()` 
  * [BC BREAK] Add return type-hints to `EntityFactory`
  * Deprecate `DbalLogger`, use a middleware instead
  * Deprecate not constructing `DoctrineDataCollector` with an instance of `DebugDataHolder`

src/Symfony/Bridge/Doctrine/CacheWarmer/ProxyCacheWarmer.php

@@ -37,10 +37,7 @@ public function isOptional(): bool
         return false;
     }
 
-    /**
-     * @param string|null $buildDir
-     */
-    public function warmUp(string $cacheDir /* , string $buildDir = null */): array
+    public function warmUp(string $cacheDir, string $buildDir = null): array
     {
         $files = [];
         foreach ($this->registry->getManagers() as $em) {