Don't retry failed backport. Just leave a message.

[Mariatta]

If celery or redis is down, then we can't perform "sleep".
Heroku's web dyno times out after 30 seconds. 😥

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[codecov]

Codecov Report

Merging #237 into master will decrease coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #237      +/-   ##
==========================================
- Coverage      96%   95.94%   -0.07%     
==========================================
  Files           9        9              
  Lines         827      813      -14     
  Branches       50       49       -1     
==========================================
- Hits          794      780      -14     
  Misses         33       33

Impacted Files	Coverage Δ
tests/test_backport_pr.py	100% <100%> (ø)	⬆️
miss_islington/backport_pr.py	100% <100%> (ø)	⬆️

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🐍🌚🤖 PR is already black! Good job!