Merge pull request #10054 from jeffhube/release-sb

Fix TraceLogSink not releasing StringBuilder back to StringBuilderCache

src/Avalonia.Base/Logging/TraceLogSink.cs

@@ -141,7 +141,7 @@ namespace Avalonia.Logging
                 result.Append(')');
             }
 
-            return result.ToString();
+            return StringBuilderCache.GetStringAndRelease(result);
         }
     }
 }