Merge branch '2.3' into 2.7

* 2.3:
  updated VERSION for 2.3.42
  update CONTRIBUTORS for 2.3.42
  updated CHANGELOG for 2.3.42
  Revert "bug #18908 [DependencyInjection] force enabling the external XML entity loaders (xabbuh)"
  Partial revert of previous PR
  [DependencyInjection] Skip deep reference check for 'service_container'
  Catch \Throwable
  [Serializer] Add missing @throws annotations
  Fix for #18843
  force enabling the external XML entity loaders
  Removed UTC specification with timestamp

Author: fabpot

Loader/FileLoader.php

@@ -113,6 +113,9 @@ public function import($resource, $type = null, $ignoreErrors = false, $sourceRe
             } catch (\Exception $e) {
                 unset(self::$loading[$resource]);
                 throw $e;
+            } catch (\Throwable $e) {
+                unset(self::$loading[$resource]);
+                throw $e;
             }
 
             unset(self::$loading[$resource]);