Merge pull request #19 from zarhus/update-kas-to-4-2

docs: getting-started: building.md: update KAS to 4.2

Author: DaniilKl

docs/getting-started/building.md

@@ -12,13 +12,13 @@ This guide will demonstrate how to build a Zarhus OS image from zero!
 * Linux PC (tested on `Fedora 40`)
 * [docker](https://docs.docker.com/engine/install/fedora/) installed
 * [kas-container
-  3.0.2](https://raw.githubusercontent.com/siemens/kas/3.0.2/kas-container)
+  4.2](https://raw.githubusercontent.com/siemens/kas/4.2/kas-container)
   script downloaded and available in
   [PATH](https://en.wikipedia.org/wiki/PATH_(variable)).
 
     ```bash
     mkdir ~/.local/bin
-    wget -O ~/.local/bin/kas-container https://raw.githubusercontent.com/siemens/kas/3.0.2/kas-container
+    wget -O ~/.local/bin/kas-container https://raw.githubusercontent.com/siemens/kas/4.2/kas-container
     chmod +x ~/.local/bin/kas-container
     ```