build: Updated ubuntu image

Signed-off-by: Philip Windecker <philip.windecker@avenyr.de>

Author: philipwindecker

.github/workflows/asciidoc-build.yml

@@ -13,7 +13,7 @@ jobs:
   asciidoctor-build:
     name: Run Asciidoctor on Documentation
 
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
 
     steps:
     # Checkout osi documentation