remove ubuntu-20.04 reference

Author: tjko

.github/workflows/compile.yml

@@ -18,7 +18,7 @@ jobs:
         include:
           - os: windows-latest
             triplet: x64-windows
-          - os: ubuntu-20.04
+          - os: ubuntu-22.04
             triplet: x64-linux
           - os: macos-latest
             triplet: x64-osx