use ubuntu-latest

[git-p4: depot-paths = "//dev/main.net/": change = 114090]

Author: fryp

.github/workflows/build.yml

@@ -30,7 +30,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, windows-latest, macOS-latest]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:
     - name: Checkout