Replace Gitpod with Codespaces. Update dependencies

Author: dhuebner

README.md

@@ -5,7 +5,7 @@ RPC messaging library for the VS Code extension platform. Makes the communicatio
 [![npm](https://img.shields.io/npm/v/vscode-messenger)](https://www.npmjs.com/package/vscode-messenger)
 [![CI](https://github.com/TypeFox/vscode-messenger/actions/workflows/main.yml/badge.svg)](https://github.com/TypeFox/vscode-messenger/actions/workflows/main.yml)
 [![License](https://img.shields.io/github/license/TypeFox/vscode-messenger?color=green)](https://github.com/TypeFox/vscode-messenger/blob/main/LICENSE)
-[![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/typefox/vscode-messenger)
+[![Codespaces](https://img.shields.io/badge/Codespaces-Open-blue?logo=github)](https://codespaces.new/TypeFox/vscode-messenger)
 
 #### Supported features