Upgrade weekly 2.6.x ci to Ubuntu-22.04 (#1055)

Signed-off-by: Mario Dominguez <mariodominguez@eprosima.com>

Author: Mario-DL

.github/workflows/weekly-ubuntu-ci.yml

@@ -11,7 +11,7 @@ jobs:
     with:
       # It would be desirable to have a matrix of ubuntu OS for this job, but due to the issue opened in this ticket:
       # https://github.com/orgs/community/discussions/128118 , it has been set as a single OS job.
-      os-version: 'ubuntu-20.04'
+      os-version: 'ubuntu-22.04'
       label: '-weekly-ubuntu-ci-2.6.x'
       fastdds-docs-branch: '2.6.x'
       fastdds-branch: '2.6.x'