Fix context merging #1722

[thomasjachmann]

When using the same key in a context hash, the new value should
overwrite the old value. Before, the value having been set first would
always win.

fixes #1722

[codecov-commenter]

Codecov Report

Merging #1724 (379d542) into master (c65088f) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1724      +/-   ##
==========================================
- Coverage   98.41%   98.38%   -0.03%     
==========================================
  Files         141      141              
  Lines        8004     8012       +8     
==========================================
+ Hits         7877     7883       +6     
- Misses        127      129       +2     

Impacted Files	Coverage Δ
sentry-ruby/lib/sentry/scope.rb	100.00% <100.00%> (ø)
sentry-ruby/spec/sentry/scope/setters_spec.rb	97.36% <100.00%> (+0.19%)	⬆️
sentry-ruby/lib/sentry/background_worker.rb	94.59% <0.00%> (-5.41%)	⬇️

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[st0012]

Yes, that's a bug. Thank you for reporting it and making the PR! 😄

[rahul342]

Thank for you fixing! Curious, is there a timeline by which this goes live in new release?

[st0012]

This should go out with version 5.1.1 next week 🙂