removing ubuntu20.04 - no longer supported

Author: JunAr7112

.github/workflows/image.yaml

@@ -38,23 +38,15 @@ jobs:
           - 570.195.03
           - 580.95.05
         dist:
-          - ubuntu20.04
           - ubuntu22.04
           - ubuntu24.04
           - rhel8
           - rhel9
         ispr:
           - ${{github.event_name == 'pull_request'}}
         exclude:
-          - ispr: true
-            dist: ubuntu20.04
-            driver: 535.274.02
           - dist: ubuntu24.04
             driver: 535.274.02
-          - dist: ubuntu20.04
-            driver: 580.95.05
-          - dist: ubuntu20.04
-            driver: 570.195.03
       fail-fast: false
     steps:
       - uses: actions/checkout@v5