Add frozen string literal comment to sentry-ruby

[st0012]

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[codecov-commenter]

Codecov Report

Merging #1623 (2ccdfbc) into master (23c66f5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1623   +/-   ##
=======================================
  Coverage   98.50%   98.50%           
=======================================
  Files         132      132           
  Lines        7341     7341           
=======================================
  Hits         7231     7231           
  Misses        110      110           

Impacted Files	Coverage Δ
sentry-ruby/lib/sentry-ruby.rb	94.17% <ø> (ø)
sentry-ruby/lib/sentry/background_worker.rb	100.00% <ø> (ø)
sentry-ruby/lib/sentry/breadcrumb.rb	100.00% <ø> (ø)
sentry-ruby/lib/sentry/breadcrumb/sentry_logger.rb	100.00% <ø> (ø)
sentry-ruby/lib/sentry/breadcrumb_buffer.rb	100.00% <ø> (ø)
sentry-ruby/lib/sentry/client.rb	100.00% <ø> (ø)
sentry-ruby/lib/sentry/configuration.rb	98.41% <ø> (ø)
sentry-ruby/lib/sentry/core_ext/object/deep_dup.rb	94.11% <ø> (ø)
...ntry-ruby/lib/sentry/core_ext/object/duplicable.rb	60.00% <ø> (ø)
sentry-ruby/lib/sentry/dsn.rb	100.00% <ø> (ø)
... and 32 more

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