Fix syntax error in `hydra-send-stats`

Dependencies

• [2] CQZQE32V Improve handling of Perl's block eval errors
• [3] DODOGD7M Send queue runner stats to statsd
• [4] LE4VZIY5 More stats

Change contents

• replacement in src/script/hydra-send-stats at line 66
  [2.1292]→[2.1292:1319](∅→∅)
  − } or do { warn "$@"; }
  [2.1292]

  [3.1046]
  + } or do { warn "$@"; };