fix: remove v6 upgrade handler from simapp

simapp/upgrades/upgrades.go

@@ -3,7 +3,6 @@ package upgrades
 import (
 	"context"
 
-	storetypes "cosmossdk.io/store/types"
 	upgradetypes "cosmossdk.io/x/upgrade/types"
 
 	"github.com/cosmos/cosmos-sdk/baseapp"
@@ -14,8 +13,6 @@ import (
 	paramskeeper "github.com/cosmos/cosmos-sdk/x/params/keeper"
 	paramstypes "github.com/cosmos/cosmos-sdk/x/params/types"
 
-	capabilitykeeper "github.com/cosmos/ibc-go/modules/capability/keeper"
-	"github.com/cosmos/ibc-go/v9/modules/apps/27-interchain-accounts/controller/migrations/v6"
 	clientkeeper "github.com/cosmos/ibc-go/v9/modules/core/02-client/keeper"
 	"github.com/cosmos/ibc-go/v9/modules/core/exported"
 	ibctmmigrations "github.com/cosmos/ibc-go/v9/modules/light-clients/07-tendermint/migrations"
@@ -24,8 +21,6 @@ import (
 const (
 	// V5 defines the upgrade name for the ibc-go/v5 upgrade handler.
 	V5 = "normal upgrade" // NOTE: keeping as "normal upgrade" as existing tags depend on this name
-	// V6 defines the upgrade name for the ibc-go/v6 upgrade handler.
-	V6 = "v6"
 	// V7 defines the upgrade name for the ibc-go/v7 upgrade handler.
 	V7 = "v7"
 	// V7_1 defines the upgrade name for the ibc-go/v7.1 upgrade handler.
@@ -49,26 +44,6 @@ func CreateDefaultUpgradeHandler(
 	}
 }
 
-// CreateV6UpgradeHandler creates an upgrade handler for the ibc-go/v6 SimApp upgrade.
-// NOTE: The v6.MigrateICS27ChannelCapabiliity function can be omitted if chains do not yet implement an ICS27 controller module
-func CreateV6UpgradeHandler(
-	mm *module.Manager,
-	configurator module.Configurator,
-	cdc codec.BinaryCodec,
-	capabilityStoreKey *storetypes.KVStoreKey,
-	capabilityKeeper *capabilitykeeper.Keeper,
-	moduleName string,
-) upgradetypes.UpgradeHandler {
-	return func(ctx context.Context, _ upgradetypes.Plan, vm module.VersionMap) (module.VersionMap, error) {
-		sdkCtx := sdk.UnwrapSDKContext(ctx)
-		if err := v6.MigrateICS27ChannelCapability(sdkCtx, cdc, capabilityStoreKey, capabilityKeeper, moduleName); err != nil {
-			return nil, err
-		}
-
-		return mm.RunMigrations(ctx, configurator, vm)
-	}
-}
-
 // CreateV7UpgradeHandler creates an upgrade handler for the ibc-go/v7 SimApp upgrade.
 func CreateV7UpgradeHandler(
 	mm *module.Manager,