feat: use epicbox subtree

Author: sneurlax

rust/Cargo.toml

@@ -45,7 +45,7 @@ epic_wallet_util = { path = "epic-wallet/util" }
 epic_wallet_controller = { path = "epic-wallet/controller" }
 
 # Epic box for posting slates and getting epic addresses.
-stack_test_epicboxlib = "1.0.3"
+epicboxlib = { path = "epicbox/epicboxlib" }
 
 url = "2.1.0"
 futures = "0.3.15"