contrib: bump dhtnet

This fixes a build issue on Fedora 41.
dhtnet#630

Change-Id: I6f4f918e933c187cf7fa16906927b8acc6ba6aae

contrib/src/dhtnet/package.json

 {
     "name": "dhtnet",
-    "version": "3a8ec3d8865e66d737dc95adf5b81d85f2f7a3bd",
+    "version": "9e98a25257da1e9f9935af38989c94eaec1aba9a",
     "url": "https://review.jami.net/plugins/gitiles/dhtnet/+archive/__VERSION__.tar.gz",
     "deps": [
         "opendht",

contrib/src/dhtnet/rules.mak

 # DHTNET
-DHTNET_VERSION := 3a8ec3d8865e66d737dc95adf5b81d85f2f7a3bd
+DHTNET_VERSION := 9e98a25257da1e9f9935af38989c94eaec1aba9a
 DHTNET_URL := https://review.jami.net/plugins/gitiles/dhtnet/+archive/$(DHTNET_VERSION).tar.gz
 
 PKGS += dhtnet