Opt into Windows SegmentHeap

SegmentHeap provides a faster malloc implementation that only available with Dynamic UCRT in Windows 10, version 2004 (build 19041) and later

src/qbittorrent.exe.manifest

@@ -40,6 +40,7 @@
   <asmv3:application>
     <asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">
       <longPathAware>true</longPathAware>
+      <heapType>SegmentHeap</heapType>
     </asmv3:windowsSettings>
   </asmv3:application>
 </assembly>