contrib: bump opendht, dhtnet, and jsoncpp (fix Windows build)

Change-Id: I52ac167389739023cc16a1750045fa3e92a51548

contrib/src/dhtnet/package.json

 {
     "name": "dhtnet",
-    "version": "baa52d973881bdc0212cae2b816b5f80997e1ee6",
+    "version": "8f7e1bde283ef9ed30230e5c39f0ec185253c7fb",
     "url": "https://review.jami.net/plugins/gitiles/dhtnet/+archive/__VERSION__.tar.gz",
     "deps": [
         "opendht",

contrib/src/jsoncpp/package.json

 {
     "name": "jsoncpp",
-    "version": "81065748e315026017c633fca1bfc57cba5b246a",
+    "version": "1.9.3",
     "url": "https://github.com/open-source-parsers/jsoncpp/archive/__VERSION__.tar.gz",
     "deps": [],
     "patches": [],

contrib/src/opendht/package.json

 {
     "name": "opendht",
-    "version": "3.1.10",
-    "url": "https://github.com/savoirfairelinux/opendht/archive/v__VERSION__.tar.gz",
+    "version": "c0a13560499551d7bb5a44fe17b2f4d033c89caa",
+    "url": "https://github.com/savoirfairelinux/opendht/archive/__VERSION__.tar.gz",
     "deps": [
         "argon2",
         "asio",