CI: Use matrix.rosdistro

This doesn't change anything, but is nicer.

Author: mintar

.github/workflows/github-actions.yml

@@ -39,7 +39,7 @@ jobs:
       run: |
         sudo rosdep init
         rosdep update
-        rosdep install --from-paths src -i -y --rosdistro noetic
+        rosdep install --from-paths src -i -y --rosdistro ${{ matrix.rosdistro }}
     - name: Build
       run: |
         . /opt/ros/${{ matrix.rosdistro }}/setup.sh