Fix GHA set-output command warning (#439)

Signed-off-by: Javier Balloffet <[email protected]>

Author: jballoffet

.github/workflows/rust-minimal.yml

@@ -45,7 +45,11 @@ jobs:
     - name: Search packages in this repository
       id: list_packages
       run: |
-        echo ::set-output name=package_list::$(colcon list --names-only)
+        {
+          echo 'package_list<<EOF'
+          colcon list --names-only
+          echo EOF
+        } >> "$GITHUB_OUTPUT"
 
     - name: Setup ROS environment
       uses: ros-tooling/[email protected]

.github/workflows/rust-stable.yml

@@ -45,7 +45,11 @@ jobs:
     - name: Search packages in this repository
       id: list_packages
       run: |
-        echo ::set-output name=package_list::$(colcon list --names-only)
+        {
+          echo 'package_list<<EOF'
+          colcon list --names-only
+          echo EOF
+        } >> "$GITHUB_OUTPUT"
 
     - name: Setup ROS environment
       uses: ros-tooling/[email protected]