Update servers_v7.json VNM (Anuken#10251)

Add VNM (`server.mindustry-tool.app`) ports from 6760 to 6780
All these ports are dynamic startup when player enter them from VNM hub, so they maybe offline sometime.

Author: SITUVNgcd

servers_v7.json

@@ -334,7 +334,7 @@
   },
   {
     "name": "VNM",
-    "address": ["server.mindustry-tool.app", "server.mindustry-tool.app:6568", "server.mindustry-tool.app:6569"]
+    "address": ["server.mindustry-tool.app", "server.mindustry-tool.app:6568", "server.mindustry-tool.app:6569", "server.mindustry-tool.app:6760", "server.mindustry-tool.app:6761", "server.mindustry-tool.app:6762", "server.mindustry-tool.app:6763", "server.mindustry-tool.app:6764", "server.mindustry-tool.app:6765", "server.mindustry-tool.app:6766", "server.mindustry-tool.app:6767", "server.mindustry-tool.app:6768", "server.mindustry-tool.app:6769", "server.mindustry-tool.app:6770", "server.mindustry-tool.app:6771", "server.mindustry-tool.app:6772", "server.mindustry-tool.app:6773", "server.mindustry-tool.app:6774", "server.mindustry-tool.app:6775", "server.mindustry-tool.app:6776", "server.mindustry-tool.app:6777", "server.mindustry-tool.app:6778", "server.mindustry-tool.app:6779", "server.mindustry-tool.app:6780"]
   },
   {
     "name": "LibreDUSTRY",