Fix uninitialized race condition in Redis integration

[sl0thentr0py]

Fixes #2054

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02 ⚠️

Comparison is base (11ecd25) 83.20% compared to head (a487a90) 83.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2057      +/-   ##
==========================================
- Coverage   83.20%   83.18%   -0.02%     
==========================================
  Files         119      119              
  Lines        5661     5662       +1     
==========================================
  Hits         4710     4710              
- Misses        951      952       +1     

Impacted Files	Coverage Δ
sentry-ruby/lib/sentry/redis.rb	42.85% <0.00%> (-0.90%)	⬇️

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[github-actions]

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## Unreleased

- Fix uninitialized race condition in Redis integration ([#2057](https://github.com/getsentry/sentry-ruby/pull/2057))

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