Update build.yml

Author: dail8859

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, windows-latest, macos-latest]
+        os: [ubuntu-latest, windows-latest, macos-latest]
         qt_version: ["5.15", "6.5", "6.8"]
         exclude:
         - os: macos-latest