contrib: update dhtnet

Change-Id: I88dd2fdd903946e09b8647c6801a2ee706f94470

contrib/src/dhtnet/package.json

 {
     "name": "dhtnet",
-    "version": "5636f7cb26ffb383d5def054aad8986cd7e12ace",
+    "version": "2f3539bc19cf770cd23912c7eebe63e8d2f80515",
     "url": "https://review.jami.net/plugins/gitiles/dhtnet/+archive/__VERSION__.tar.gz",
     "deps": [
         "opendht",

contrib/src/dhtnet/rules.mak

 # DHTNET
-DHTNET_VERSION := 5636f7cb26ffb383d5def054aad8986cd7e12ace
+DHTNET_VERSION := 2f3539bc19cf770cd23912c7eebe63e8d2f80515
 DHTNET_URL := https://review.jami.net/plugins/gitiles/dhtnet/+archive/$(DHTNET_VERSION).tar.gz
 
 PKGS += dhtnet