contrib: bump dhtnet

This should fix the following issue:
jami-client-qt#1898

Change-Id: I508e02b7fd1870228801dc7f773ff586f439c4ed

contrib/src/dhtnet/package.json

 {
     "name": "dhtnet",
-    "version": "7889017472aca87e7fbd1845ff94bdecb502d4ed",
+    "version": "f0f834df3d62cbcb17c67225ce09303847eebb6f",
     "url": "https://review.jami.net/plugins/gitiles/dhtnet/+archive/__VERSION__.tar.gz",
     "deps": [
         "opendht",

contrib/src/dhtnet/rules.mak

 # DHTNET
-DHTNET_VERSION := 7889017472aca87e7fbd1845ff94bdecb502d4ed
+DHTNET_VERSION := f0f834df3d62cbcb17c67225ce09303847eebb6f
 DHTNET_URL := https://review.jami.net/plugins/gitiles/dhtnet/+archive/$(DHTNET_VERSION).tar.gz
 
 PKGS += dhtnet