Bump evaluation timeout to 6 hours

Dependencies

• [2] WVD3YYON hydra-evaluator: Add some debug code
• [3] QMW24O5S Add support for Guile & Guix.
• [4] IMQRX4MP hydra-eval-jobs: Use JSON instead of XML
• [*] OOQ2D3KC * Refactoring: move fetchInput out of hydra_scheduler into a separate

Change contents

• replacement in src/lib/Hydra/Helper/AddBuilds.pm at line 349
  [2.379]→[2.379:455](∅→∅)
  − (my $res, my $jobsJSON, my $stderr) = captureStdoutStderr(10800, @cmd);
  [2.379]

  [3.2016]
  + (my $res, my $jobsJSON, my $stderr) = captureStdoutStderr(21600, @cmd);