Followup to: Issue #3046419 by Pancho, mondrake, wizonesolutions: Set locale...

Followup to: Issue #3046419 by Pancho, mondrake, wizonesolutions: Set locale to support filenames with non-ASCII characters in pdftk

src/ShellManager.php

@@ -60,7 +60,7 @@ class ShellManager implements ShellManagerInterface {
   /**
    * {@inheritdoc}
    */
-  public function escapeShellArg(string $arg) {
+  public function escapeShellArg($arg) {
     // Put the configured locale in a static to avoid multiple config get calls
     // in the same request.
     static $config_locale;

src/ShellManagerInterface.php

@@ -53,6 +53,6 @@ interface ShellManagerInterface {
    *
    * @see https://www.drupal.org/project/drupal/issues/1561214
    */
-  public function escapeShellArg(string $arg);
+  public function escapeShellArg($arg);
 
 }