[#468] Update neo-go to v0.94.1

New neo-go version provides:
- new type for roles in `RoleManagement` contract,
- methods to get keys from `RoleManagement` contract,
- new way to sign notary transaction.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/morph/client/constructor.go

@@ -100,11 +100,6 @@ func New(key *ecdsa.PrivateKey, endpoint string, opts ...Option) (*Client, error
 		return nil, err
 	}
 
-	neo, err := cli.GetNativeContractHash(nativenames.Neo)
-	if err != nil {
-		return nil, err
-	}
-
 	designate, err := cli.GetNativeContractHash(nativenames.Designation)
 	if err != nil {
 		return nil, err
@@ -115,7 +110,6 @@ func New(key *ecdsa.PrivateKey, endpoint string, opts ...Option) (*Client, error
 		client:       cli,
 		acc:          account,
 		gas:          gas,
-		neo:          neo,
 		designate:    designate,
 		waitInterval: cfg.waitInterval,
 	}, nil