Bump opentelemetry-instrumentation-koala from 0.20.5 to 0.20.6

Bumps [opentelemetry-instrumentation-koala](https://github.com/open-telemetry/opentelemetry-ruby-contrib) from 0.20.5 to 0.20.6.
- [Release notes](https://github.com/open-telemetry/opentelemetry-ruby-contrib/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-ruby-contrib/blob/main/instrumentation/koala/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-ruby-contrib@opentelemetry-instrumentation-koala/v0.20.5...opentelemetry-instrumentation-koala/v0.20.6)

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

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

Gemfile.lock

@@ -463,7 +463,7 @@ GEM
     opentelemetry-instrumentation-http_client (0.22.8)
       opentelemetry-api (~> 1.0)
       opentelemetry-instrumentation-base (~> 0.22.1)
-    opentelemetry-instrumentation-koala (0.20.5)
+    opentelemetry-instrumentation-koala (0.20.6)
       opentelemetry-api (~> 1.0)
       opentelemetry-instrumentation-base (~> 0.22.1)
     opentelemetry-instrumentation-lmdb (0.22.3)