feat: Add x/gov v043->v046 migrations (#11036)

## Description

Closes: #10869

depends on: 
- [x] #11029 



---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

x/genutil/client/cli/migrate.go

@@ -16,6 +16,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/version"
 	v040 "github.com/cosmos/cosmos-sdk/x/genutil/migrations/v040"
 	v043 "github.com/cosmos/cosmos-sdk/x/genutil/migrations/v043"
+	v046 "github.com/cosmos/cosmos-sdk/x/genutil/migrations/v046"
 	"github.com/cosmos/cosmos-sdk/x/genutil/types"
 )
 
@@ -26,7 +27,8 @@ const flagGenesisTime = "genesis-time"
 // Ref: https://github.com/cosmos/cosmos-sdk/issues/5041
 var migrationMap = types.MigrationMap{
 	"v0.42": v040.Migrate, // NOTE: v0.40, v0.41 and v0.42 are genesis compatible.
-	"v0.43": v043.Migrate,
+	"v0.43": v043.Migrate, // NOTE: v0.43, v0.44 and v0.45 are genesis compatible.
+	"v0.46": v046.Migrate,
 }
 
 // GetMigrationCallback returns a MigrationCallback for a given version.

x/genutil/migrations/v046/migrate.go

@@ -0,0 +1,32 @@
+package v046
+
+import (
+	"github.com/cosmos/cosmos-sdk/client"
+	"github.com/cosmos/cosmos-sdk/x/genutil/types"
+	v043gov "github.com/cosmos/cosmos-sdk/x/gov/migrations/v043"
+	v046gov "github.com/cosmos/cosmos-sdk/x/gov/migrations/v046"
+	gov "github.com/cosmos/cosmos-sdk/x/gov/types/v1beta1"
+)
+
+// Migrate migrates exported state from v0.43 to a v0.46 genesis state.
+func Migrate(appState types.AppMap, clientCtx client.Context) types.AppMap {
+	// Migrate x/gov.
+	if appState[v043gov.ModuleName] != nil {
+		// unmarshal relative source genesis application state
+		var oldGovState gov.GenesisState
+		clientCtx.Codec.MustUnmarshalJSON(appState[v043gov.ModuleName], &oldGovState)
+
+		// delete deprecated x/gov genesis state
+		delete(appState, v043gov.ModuleName)
+
+		// Migrate relative source genesis application state and marshal it into
+		// the respective key.
+		newGovState, err := v046gov.MigrateJSON(&oldGovState)
+		if err != nil {
+			panic(err)
+		}
+		appState[v046gov.ModuleName] = clientCtx.Codec.MustMarshalJSON(newGovState)
+	}
+
+	return appState
+}