Upgrade explorer backend API to 2.0.0

Author: nop33

packages/web3/package.json

@@ -34,7 +34,7 @@
   "author": "Alephium dev <dev@alephium.org>",
   "config": {
     "alephium_version": "3.3.0",
-    "explorer_backend_version": "1.19.3"
+    "explorer_backend_version": "2.0.0"
   },
   "scripts": {
     "build": "rm -rf dist/* && npx tsc --build . && webpack",