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.

tools/apertis-pkg-merge-updates

@@ -15,10 +15,12 @@ from pathlib import Path
 
 from debian.changelog import Changelog, VersionError, format_date
 from debian.debian_support import Version
+from sh import __version__ as sh_version
 from sh.contrib import git
 
 APERTIS_CI_NAME = "Apertis CI"
 APERTIS_CI_EMAIL = "devel@lists.apertis.org"
+RETURN_CMD = {} if sh_version.startswith("1.") else {"_return_cmd": True}
 
 
 def git_dir() -> str:
@@ -176,7 +178,7 @@ def main():
                 "merge",
                 "--ff-only",
                 rebase_tip,
-                _return_cmd=True,
+                **RETURN_CMD,
                 _ok_code=[0, 128],
                 _out="/dev/stdout",
                 _err="/dev/stderr",
@@ -216,7 +218,7 @@ def main():
         args.upstream,
         ":!debian/changelog",
         ":!debian/apertis/*",
-        _return_cmd=True,
+        **RETURN_CMD,
         _ok_code=[0, 1],
     )
     msg = [f"Sync from {args.upstream}."]