Bump sentry-ruby from 5.16.1 to 5.21.0 (#675)

* Bump sentry-ruby from 5.16.1 to 5.21.0

Bumps [sentry-ruby](https://github.com/getsentry/sentry-ruby) from 5.16.1 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@5.16.1...5.21.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

* Sentry changed the logging

The new line read

    Initializing the Sentry background worker with 4 threads

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Patrik Ragnarsson <[email protected]>

Gemfile.lock

@@ -8,7 +8,7 @@ GEM
     bigdecimal (3.1.8)
     climate_control (1.2.0)
     commonmarker (0.23.10)
-    concurrent-ruby (1.2.3)
+    concurrent-ruby (1.3.4)
     crack (1.0.0)
       bigdecimal
       rexml
@@ -111,7 +111,8 @@ GEM
     selma (0.2.2-aarch64-linux)
     selma (0.2.2-arm64-darwin)
     selma (0.2.2-x86_64-linux)
-    sentry-ruby (5.16.1)
+    sentry-ruby (5.21.0)
+      bigdecimal
       concurrent-ruby (~> 1.0, >= 1.0.2)
     sequel (5.84.0)
       bigdecimal

test/integration/app_boot_test.rb

@@ -75,7 +75,7 @@ def test_app_lowlevel_error_handler
 
       get_http_response(port: port)
 
-      assert spawn.wait("DEBUG -- sentry: ** [Sentry] Initializing the background worker")
+      assert spawn.wait("DEBUG -- sentry: ** [Sentry] Initializing")
       assert spawn.wait("puma lowlevel_error_handler ran")
     end
   end