Bump opentelemetry-instrumentation-ruby_kafka from 0.21.1 to 0.21.2

Bumps [opentelemetry-instrumentation-ruby_kafka](https://github.com/open-telemetry/opentelemetry-ruby-contrib) from 0.21.1 to 0.21.2.
- [Release notes](https://github.com/open-telemetry/opentelemetry-ruby-contrib/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-ruby-contrib/blob/main/instrumentation/ruby_kafka/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-ruby-contrib@opentelemetry-instrumentation-ruby_kafka/v0.21.1...opentelemetry-instrumentation-ruby_kafka/v0.21.2)

---
updated-dependencies:
- dependency-name: opentelemetry-instrumentation-ruby_kafka
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -364,7 +364,7 @@ GEM
     opentelemetry-instrumentation-restclient (0.22.6)
       opentelemetry-api (~> 1.0)
       opentelemetry-instrumentation-base (~> 0.22.1)
-    opentelemetry-instrumentation-ruby_kafka (0.21.1)
+    opentelemetry-instrumentation-ruby_kafka (0.21.2)
       opentelemetry-api (~> 1.0)
       opentelemetry-instrumentation-base (~> 0.22.1)
     opentelemetry-instrumentation-sidekiq (0.25.6)