Update ubuntu version in integration tests workflow

Ubuntu 20.04 is no longer supported in the CI.

Signed-off-by: Daniel Zullo <[email protected]>

Author: daniel-zullo-frequenz

.github/workflows/integration_test.yml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - ubuntu-20.04
+          - ubuntu-24.04
         python:
           - "3.11"
     runs-on: ${{ matrix.os }}
@@ -51,5 +51,3 @@ jobs:
         run: |
           pytest -vv integration_tests/
         timeout-minutes: 10
-
-