[DependencyInjection] fix creating 2nd container instances

Author: nicolas-grekas

Dumper/PhpDumper.php

@@ -1485,7 +1485,7 @@ private function addInlineRequires(bool $hasProxyClasses): string
         }
 
         if ($hasProxyClasses) {
-            $code .= "\n            include __DIR__.'/proxy-classes.php';";
+            $code .= "\n            include_once __DIR__.'/proxy-classes.php';";
         }
 
         return $code ? sprintf("\n        \$this->privates['service_container'] = function () {%s\n        };\n", $code) : '';

Tests/Fixtures/php/services9_lazy_inlined_factories.txt

@@ -60,7 +60,7 @@ class ProjectServiceContainer extends Container
         $this->aliases = [];
 
         $this->privates['service_container'] = function () {
-            include __DIR__.'/proxy-classes.php';
+            include_once __DIR__.'/proxy-classes.php';
         };
     }