Bump sentry-ruby from 5.20.1 to 5.21.0

Bumps [sentry-ruby](https://github.com/getsentry/sentry-ruby) from 5.20.1 to 5.21.0.
- [Release notes](https://github.com/getsentry/sentry-ruby/releases)
- [Changelog](https://github.com/getsentry/sentry-ruby/blob/master/CHANGELOG.md)
- [Commits](getsentry/sentry-ruby@5.20.1...5.21.0)

---
updated-dependencies:
- dependency-name: sentry-ruby
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -138,7 +138,7 @@ GEM
  sawyer (0.9.2)
  addressable (>= 2.3.5)
  faraday (>= 0.17.3, < 3)
- sentry-ruby (5.20.1)
+ sentry-ruby (5.21.0)
  bigdecimal
  concurrent-ruby (~> 1.0, >= 1.0.2)
  signet (0.19.0)