[#28] Replace interface{} with any

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

signature/body.go

@@ -11,7 +11,7 @@ import (
 )
 
 // nolint:funlen
-func serviceMessageBody(req interface{}) stableMarshaler {
+func serviceMessageBody(req any) stableMarshaler {
 	switch v := req.(type) {
 	default:
 		panic(fmt.Sprintf("unsupported session message %T", req))

signature/sign.go

@@ -29,7 +29,7 @@ type signatureReceiver interface {
 }
 
 // SignServiceMessage signes service message with key.
-func SignServiceMessage(key *ecdsa.PrivateKey, msg interface{}) error {
+func SignServiceMessage(key *ecdsa.PrivateKey, msg any) error {
 	switch v := msg.(type) {
 	case nil:
 		return nil

signature/verify.go

@@ -17,7 +17,7 @@ type signatureProvider interface {
 }
 
 // VerifyServiceMessage verifies service message.
-func VerifyServiceMessage(msg interface{}) error {
+func VerifyServiceMessage(msg any) error {
 	switch v := msg.(type) {
 	case nil:
 		return nil