removing ubuntu 20.04 from matrix

Author: nikolay-e

.github/workflows/ci.yml

@@ -54,7 +54,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-20.04, ubuntu-22.04, ubuntu-24.04, macos-latest, windows-latest ]
+        os: [ ubuntu-22.04, ubuntu-24.04, macos-latest, windows-latest ]
         python-version: [ 3.9, '3.10', '3.11', '3.12' ]
 
     runs-on: ${{ matrix.os }}