CI: Update github runners

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>

Author: andyhhp

.github/workflows/build.yml

@@ -6,7 +6,7 @@ jobs:
   python:
     name: "Python Tests"
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
     - name: Checkout code