Switch ubuntu-20.04 -> ubuntu-latest

ubuntu-20.04 was retired in May 2025

Signed-off-by: Petr "Stone" Hracek <[email protected]>

Author: phracek

.github/workflows/container-tests.yml

@@ -8,7 +8,7 @@ jobs:
   build:
     # This job only runs for '[test]' pull request comments by owner, member
     name: Container-tests by GitHub Action on Testing Farm service
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:

.github/workflows/sanity-tests.yaml

@@ -8,7 +8,7 @@ jobs:
   sanity:
     # This job only runs for '[test]' pull request comments by owner, member
     name: Sanity tests
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     if: |
       github.event.issue.pull_request
       && (contains(github.event.comment.body, '[test]') || contains(github.event.comment.body, '[test-all]'))