chore: Branch out for Kilted (#1166)

* Remove stale workflow and dependabot config

* Test only kilted distribution

Author: bjsowa

.github/dependabot.yml

@@ -26,13 +26,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          # Test supported ROS 2 distributions
-          # https://docs.ros.org/en/rolling/Releases.html
-          # NOTE: Humble and Jazzy do not work on the `ros2` branch, so they are tested in their own branches.
           - ros: kilted
             os: ubuntu-24.04
-          - ros: rolling
-            os: ubuntu-24.04
 
     name: ROS 2 ${{ matrix.ros }} (${{ matrix.os }})
     runs-on: ${{ matrix.os }}