Fix rebase order in generate-bindings workflow (#541)

Author: knmcguire

.github/workflows/generate-bindings.yml

@@ -99,10 +99,10 @@ jobs:
           CREATE_PR=1
           git checkout -b update-bindings-${{ matrix.ros_distribution }}
         fi
-        git fetch origin update-bindings-${{ matrix.ros_distribution }}
-        git rebase origin/update-bindings-${{ matrix.ros_distribution }}
         git add rclrs/src/rcl_bindings_generated_${{ matrix.ros_distribution }}.rs
         git commit -m "Regenerate bindings for ${{ matrix.ros_distribution }}"
+        git fetch origin update-bindings-${{ matrix.ros_distribution }}
+        git rebase origin/update-bindings-${{ matrix.ros_distribution }}
         git push -u origin update-bindings-${{ matrix.ros_distribution }}
         if [ $CREATE_PR -eq 1 ]; then
           gh pr create --base main --head update-bindings-${{ matrix.ros_distribution }} --title "Regenerate bindings for ${{ matrix.ros_distribution }}" --body "This PR regenerates the bindings for ${{ matrix.ros_distribution }}."