contrib: bump dhtnet

The latest version of DHTNet includes a fix for a serious bug in the
handling of the NAT-PMP protocol.
dhtnet#33

Change-Id: I31b8d51f8bc1c713d7e1046d98c50f16345bf17d

contrib/src/dhtnet/package.json

 {
     "name": "dhtnet",
-    "version": "77331098ff663a5ac54fae7d0bedafe076c575a1",
+    "version": "9e064bf993e8fa87609ce756f035a59d925efb70",
     "url": "https://review.jami.net/plugins/gitiles/dhtnet/+archive/__VERSION__.tar.gz",
     "deps": [
         "opendht",

contrib/src/dhtnet/rules.mak

 # DHTNET
-DHTNET_VERSION := cfe512b0632eea046f683b22e42d01eeb943d751
+DHTNET_VERSION := 9e064bf993e8fa87609ce756f035a59d925efb70
 DHTNET_URL := https://review.jami.net/plugins/gitiles/dhtnet/+archive/$(DHTNET_VERSION).tar.gz
 
 PKGS += dhtnet