hydra-queue-runner: Fix message

Dependencies

• [2] LVQXQIYA Kill active build steps when builds are cancelled
• [3] MHVIT4JY Split hydra-queue-runner.cc more
• [4] EHEQ4AY3 Fix retry of transient failures

Change contents

• replacement in src/hydra-queue-runner/builder.cc at line 169
  [2.1365]→[2.1365:1453](∅→∅)
  − printInfo("marking step %d of build %d as succeeded", stepNr, buildId);
  [2.1365]

  [2.1453]
  + printInfo("marking step %d of build %d as cancelled", stepNr, buildId);