fix: update validator reward address (#350)

This used to be the first address in the prefunded accounts; when we
updated the keys we forgot to update this

src/package_io/constants.star

@@ -29,7 +29,7 @@ CLIENT_TYPES = struct(
     validator="validator",
 )
 
-VALIDATING_REWARDS_ACCOUNT = "0x878705ba3f8Bc32FCf7F4CAa1A35E72AF65CF766"
+VALIDATING_REWARDS_ACCOUNT = "0x8943545177806ED17B9F23F0a21ee5948eCaa776"
 MAX_ENR_ENTRIES = 20
 MAX_ENODE_ENTRIES = 20