Remove Ubuntu 20.04 runners and bump containerd versions

Signed-off-by: Maksym Pavlenko <[email protected]>

Author: mxpv

.github/workflows/ci.yml

@@ -128,8 +128,8 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-20.04, ubuntu-22.04]
-        containerd: [v1.6.36, v1.7.24, v2.0.1]
+        os: [ubuntu-22.04]
+        containerd: [v1.6.38, v1.7.27, v2.0.5]
 
     steps:
       - name: Checkout extensions