Set minimal Ubuntu version to 22.04 for github flow

20.04 deprecated and will be removed 2025.05.15.

Be ready, that 20.04 building can be brokken. I will open for 20.04
builds fixes, but it will not be automatically checked anymore.

Author: h4tr3d

.github/workflows/cmake-ci.yml

@@ -21,10 +21,10 @@ jobs:
         build_type: [Release, Debug]
         skip_meson: [false]
         include:
-          - os: ubuntu-20.04
+          - os: ubuntu-22.04
             build_type: Release
             skip_meson: true
-          - os: ubuntu-20.04
+          - os: ubuntu-22.04
             build_type: Debug
             skip_meson: true