Use Netty's pooled memory allocator

Instead of the adaptative one, which is the default in 4.2.
The pooled allocator was the default in 4.1.

Author: rabbitmq-ci

1.5.0-SNAPSHOT/htmlsingle/index.html

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 Version 1.5.0-SNAPSHOT<br>
-Last updated 2025-05-22 05:02:01 UTC
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snapshot/htmlsingle/index.html

@@ -1544,7 +1544,7 @@ <h2 id="building-the-performance-tool"><a class="anchor" href="#building-the-per
 <div id="footer">
 <div id="footer-text">
 Version 1.5.0-SNAPSHOT<br>
-Last updated 2025-05-22 05:02:01 UTC
+Last updated 2025-05-23 05:02:05 UTC
 </div>
 </div>
 </body>