Update node requirement in readme [notarize]

Author: tkleinke

desktop/README.md

@@ -8,7 +8,7 @@ Please refer to the [wiki](https://github.com/dainst/idai-field/wiki).
 
 ## Development
 
-Development of Field Desktop works under **MacOS**, **Windows** and **Linux**. In any case, before you start, make sure you have [NodeJS](https://nodejs.org/en/) 20.18 as well as Node Package Manager ([NPM](https://www.npmjs.com/)) installed.  
+Development of Field Desktop works under **MacOS**, **Windows** and **Linux**. In any case, before you start, make sure you have [NodeJS](https://nodejs.org/en/) 22 as well as Node Package Manager ([NPM](https://www.npmjs.com/)) installed.  
 
 Then clone this repository locally and run the following commands (in the repository root):