Update sentry-ruby monorepo to v5.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sentry-rails (source, changelog)	5.20.1 -> 5.21.0
sentry-ruby (source, changelog)	5.20.1 -> 5.21.0

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Release Notes

getsentry/sentry-ruby (sentry-rails)

v5.21.0

Compare Source

Features

• Experimental support for multi-threaded profiling using Vernier (#​2372)

  You can have much better profiles if you're using multi-threaded servers like Puma now by leveraging Vernier.
  To use it, first add vernier to your Gemfile and make sure it is loaded before sentry-ruby.

Gemfile

gem 'vernier'
gem 'sentry-ruby'

Then, set a `profiles_sample_rate` and the new `profiler_class` configuration in your sentry initializer to use the new profiler.

```ruby

### config/initializers/sentry.rb

Sentry.init do |config|

### ...
  config.profiles_sample_rate = 1.0
  config.profiler_class = Sentry::Vernier::Profiler
end

Internal

• Profile items have bigger size limit now (#​2421)
• Consistent string freezing (#​2422)

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Code Coverage Report: Only Changed Files listed

Package	Coverage
Overall Coverage	🟢 85%

Minimum allowed coverage is 0%, this run produced 85%