Use Ubuntu 22.04 for GitHub Actions

Author: erez-tom

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-20.04
+          - os: ubuntu-22.04
             additional_label: "with Clang 12"
             cmake_args: >-
               -G Ninja