modify maxmemocharlength (backport #5442) (#5500)

* imp(statemachine)!: increase ICA `MaxMemoCharLength` (#5442)

Co-authored-by: DimitrisJim <d.f.hilliard@gmail.com>
Co-authored-by: Carlos Rodriguez <carlos@interchain.io>
(cherry picked from commit 335e4ff)

* add changelog

---------

Co-authored-by: chandiniv1 <117723967+chandiniv1@users.noreply.github.com>
Co-authored-by: Carlos Rodriguez <carlos@interchain.io>

CHANGELOG.md

@@ -42,6 +42,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### State Machine Breaking
 
+* (apps/27-interchain-accounts) [\#5442](https://github.com/cosmos/ibc-go/pull/5442) Increase the maximum allowed length for the memo field of `InterchainAccountPacketData`.
+
 ### Improvements
 
 ### Features

modules/apps/27-interchain-accounts/types/packet.go

@@ -19,7 +19,7 @@ var (
 )
 
 // MaxMemoCharLength defines the maximum length for the InterchainAccountPacketData memo field
-const MaxMemoCharLength = 256
+const MaxMemoCharLength = 32768
 
 var (
 	// DefaultRelativePacketTimeoutHeight is the default packet timeout height (in blocks) relative

modules/apps/27-interchain-accounts/types/packet_test.go

@@ -7,8 +7,6 @@ import (
 	ibctesting "github.com/cosmos/ibc-go/v8/testing"
 )
 
-var largeMemo = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum"
-
 func (suite *TypesTestSuite) TestValidateBasic() {
 	testCases := []struct {
 		name       string
@@ -64,7 +62,7 @@ func (suite *TypesTestSuite) TestValidateBasic() {
 			types.InterchainAccountPacketData{
 				Type: types.EXECUTE_TX,
 				Data: []byte("data"),
-				Memo: largeMemo,
+				Memo: ibctesting.GenerateString(types.MaxMemoCharLength + 1),
 			},
 			false,
 		},