Fix breadcrumbs with warn level not being ingested

[sl0thentr0py]

Fixes #2145

[codecov]

Codecov Report

Merging #2150 (10d3bfe) into master (1c0550f) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2150      +/-   ##
==========================================
+ Coverage   97.27%   97.30%   +0.02%     
==========================================
  Files          97       97              
  Lines        3630     3632       +2     
==========================================
+ Hits         3531     3534       +3     
+ Misses         99       98       -1     

Components	Coverage Δ
sentry-ruby	97.98% <100.00%> (+<0.01%)	⬆️
sentry-rails	94.96% <ø> (ø)
sentry-sidekiq	93.70% <ø> (ø)
sentry-resque	93.65% <ø> (+1.58%)	⬆️
sentry-delayed_job	94.36% <ø> (ø)
sentry-opentelemetry	100.00% <ø> (ø)

Files	Coverage Δ
sentry-ruby/lib/sentry/breadcrumb.rb	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes