Re-add ruby head to ci

[solnic]

#skip-changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.03%. Comparing base (9486527) to head (c557e0b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2631      +/-   ##
==========================================
+ Coverage   96.36%   97.03%   +0.67%     
==========================================
  Files         133      133              
  Lines        5110     5098      -12     
==========================================
+ Hits         4924     4947      +23     
+ Misses        186      151      -35     

Components	Coverage Δ
sentry-ruby	97.44% <ø> (-0.16%)	⬇️
sentry-rails	95.39% <ø> (+5.59%)	⬆️
sentry-sidekiq	95.81% <ø> (+1.18%)	⬆️
sentry-resque	94.44% <ø> (ø)
sentry-delayed_job	94.68% <ø> (ø)
sentry-opentelemetry	98.62% <ø> (ø)

see 17 files with indirect coverage changes

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