[INTERNAL] index.md: Update emoji regarding v4 release

Author: flovogt

docs/index.md

@@ -5,7 +5,7 @@
 An open and modular toolchain to develop state-of-the-art applications based on the [UI5](https://ui5.sap.com) framework.
 
 !!! tip "In Development"
-	**UI5 Tooling V4 is still in development 🎉**
+	**UI5 Tooling V4 is still in development 🚧**
 
 	Please use UI5 Tooling V3 by installing the latest version via: `npm i --save-dev @ui5/cli@latest`