Issue #3341224: Always catch \Throwable, not \Exception and always pass the old exception when re-throwing.

package_manager/src/Validator/ComposerSettingsValidator.php

@@ -45,8 +45,8 @@ final class ComposerSettingsValidator implements EventSubscriberInterface {
     try {
       $setting = (int) $this->inspector->getConfig('secure-http', $dir);
     }
-    catch (\Exception $exception) {
-      $event->addErrorFromThrowable($exception, $this->t('Unable to determine Composer <code>secure-http</code> setting.'));
+    catch (\Throwable $throwable) {
+      $event->addErrorFromThrowable($throwable, $this->t('Unable to determine Composer <code>secure-http</code> setting.'));
       return;
     }
     if ($setting !== 1) {