Increase timeout of file concatenation command

Double the timeout of the command in order to allow concatenation of
more and larger files.

src/Cutting.php

@@ -96,7 +96,10 @@ class Cutting
         }
 
         $command = 'printf ' . escapeshellarg(implode('\n', $lines)) . ' > ' . $this->getConcatFilename();
-        return Process::fromShellCommandline($command);
+        $process = Process::fromShellCommandline($command);
+        $process->setTimeout(2 * 60);
+
+        return $process;
     }
 
     public function getCommandForGeneratingVideo(): Process