chore: v4.3 release notes (#1979)

* chore: v4.3 release notes

* changelog

CHANGELOG.md

@@ -46,6 +46,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
 
+## [v4.3.0](https://github.com/umee-network/umee/releases/tag/v4.3.0) - 2023-04-5
+
 ### Features
 
 - [1963](https://github.com/umee-network/umee/pull/1963) ICA Host integration.

RELEASE_NOTES.md

@@ -10,6 +10,7 @@ Release Procedure is defined in the [CONTRIBUTING](CONTRIBUTING.md#release-proce
 
 Highlights:
 
+- Gravity Bridge Shutdown Phase 2. Following [Prop-67](https://www.mintscan.io/umee/proposals/67) we are disabling Umee -> Ethereum token transfers. Ethereum -> Umee transfers are still possible, and we encourage everyone to move the tokens back to Umee. In May we are planning the complete shut down. See more in the [blog post](https://umee.cc/blog/bridgemigration).
 - IBC updated to `ibc-go v6.1`. That also triggered our wasmvm dependency update (see `libwasmvm` update in Validators section)
 - ICA Host integration.
 - IBC ICS20: we will only accept tokens (denoms) which are registered in the x/leverage token registry. You can check the supported tokens by `umeed q leverage registered-tokens` or by visiting [umee/leverage/v1/registered_tokens](https://umee-api.polkachu.com/umee/leverage/v1/registered_tokens).

app/upgrades.go

@@ -51,7 +51,7 @@ func (app UmeeApp) RegisterUpgradeHandlers(bool) {
 
 // performs upgrade from v4.2 to v4.3
 func (app *UmeeApp) registerUpgrade4_3(upgradeInfo upgradetypes.Plan) {
-	const planName = "v4.3-beta" // TODO: change before the main release
+	const planName = "v4.3"
 	app.UpgradeKeeper.SetUpgradeHandler(planName, onlyModuleMigrations(app, planName))
 	app.UpgradeKeeper.SetUpgradeHandler(planName,
 		func(ctx sdk.Context, plan upgradetypes.Plan, fromVM module.VersionMap) (module.VersionMap, error) {