Bump org.asynchttpclient:async-http-client (#20754)

Bumps [org.asynchttpclient:async-http-client](https://github.com/AsyncHttpClient/async-http-client) from 2.12.4 to 2.15.0.
- [Release notes](https://github.com/AsyncHttpClient/async-http-client/releases)
- [Commits](AsyncHttpClient/async-http-client@async-http-client-project-2.12.4...async-http-client-project-2.15.0)

---
updated-dependencies:
- dependency-name: org.asynchttpclient:async-http-client
  dependency-version: 2.15.0
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

bundles/org.openhab.binding.tellstick/pom.xml

@@ -36,7 +36,7 @@
     <dependency>
       <groupId>org.asynchttpclient</groupId>
       <artifactId>async-http-client</artifactId>
-      <version>2.12.4</version>
+      <version>2.15.0</version>
       <scope>compile</scope>
     </dependency>
     <dependency>