Use ubuntu 20

Author: nirinchev

.github/workflows/test-and-build.yaml

@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-22.04, windows-2019, macos-latest]
+        os: [ubuntu-20.04, windows-2019, macos-latest]
       fail-fast: false
 
     runs-on: ${{ matrix.os }}