bump to node v24 in README requirements section

Author: ElliotFriend

README.md

@@ -61,7 +61,7 @@ If you have questions, feel free to ask in the [Stellar Developer Discord](https
 
 To begin development on the documentation, you will first need to install the following:
 
-- Node.js (v22, or higher): see https://nodejs.org/en/download/package-manager for details for your system
+- Node.js (v24, or higher): see https://nodejs.org/en/download/package-manager for details for your system
 - npm: e.g. `sudo apt install npm` on Ubuntu
 - yarn: `npm install yarn`
   - If you're getting dependency errors, try using `npm install yarn --legacy-peer-deps`