Add a note about adding breaking dependencies to the exclusion list

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>

Author: llucax

cookiecutter/migrate.py

@@ -134,6 +134,11 @@ def regroup_dependabot() -> None:
         content=dependabot_content,
     )
 
+    manual_step(
+        "Please check your dependencies and if you have other dependencies at "
+        "v0.x.x or that break often, add them to the exclusion list."
+    )
+
 
 def upgrade_to_ubuntu_24_04() -> None:
     """Upgrade GitHub workflows from Ubuntu 20.04 to 24.04."""