ci: switch to ubuntu 22.04 (20.04 EOL)

Author: ErikBjare

.github/workflows/build.yml

@@ -26,7 +26,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, windows-latest, macOS-13]
+        os: [ubuntu-22.04, windows-latest, macOS-13]
         python_version: [3.9]
         node_version: [20]
         skip_rust: [false]