Update for compatibility with Trixie

Update for compatibility with Trixie:

• apertis-pkg-merge-upstream-to-downstreams: Don't print useless information while canceling pipelines.
• apertis-pkg-merge-upstream-to-downstreams: ensure merge request is created against the right project.
• Make sure the returned value of an executed sh is still a RunningCommand object.

debian/changelog

+apertis-dev-tools (0.2026.0) apertis; urgency=medium
+
+  * apertis-pkg-merge-upstream-to-downstreams:
+      - Don't print useless information while canceling pipelines.
+      - ensure merge request is created against the right project:
+        In case of a forked project, like we are doing with the test of the
+        rebase, the GitLab API creates by default the MR against the original
+        project instead of the forked project. To ensure the merge request is
+        created against the forked project, we use the push option
+        merge_request.target_project to overwrite the default behavior and to
+        create the merge request against the forked project.
+  * Use upstream recommended workaround to still return a RunningCommand object
+    of an executed sh command. This is required due to a breaking change in
+    python3-sh 2.x.
+  * Keep compatibility with python3-sh 1.x, by using _return_cmd
+    only when required.
+
+ -- Walter Lozano <walter.lozano@collabora.com>  Wed, 19 Feb 2025 13:55:39 +0100
+
 apertis-dev-tools (0.2024.19) apertis; urgency=medium
 
   * ci-license-scan: Add proposed whitelist.