Fixed some deprecations.

src/Command/Attachments/CleanAttachmentsCommand.php

@@ -146,9 +146,9 @@ class CleanAttachmentsCommand extends Command
     /**
      * This function removes all empty folders inside $path. Taken from https://stackoverflow.com/a/1833681.
      *
-     * @param string $path The path in which the empty folders should be deleted
+     * @param  string  $path The path in which the empty folders should be deleted
      */
-    protected function removeEmptySubFolders($path): bool
+    protected function removeEmptySubFolders(string $path): bool
     {
         $empty = true;
         foreach (glob($path.DIRECTORY_SEPARATOR.'*') as $file) {

src/Command/Logs/ShowEventLogCommand.php

@@ -76,7 +76,7 @@ class ShowEventLogCommand extends Command
         parent::__construct();
     }
 
-    public function execute(InputInterface $input, OutputInterface $output)
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
 

src/Command/User/UserListCommand.php

@@ -31,7 +31,7 @@ class UserListCommand extends Command
         ;
     }
 
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);