Update to setOutput

command deprecation

Author: prathapkillis10005

.github/workflows/mavros_mission_tests.yml

@@ -39,7 +39,7 @@ jobs:
       shell: cmake -P {0}
       run: |
         string(TIMESTAMP current_date "%Y-%m-%d-%H;%M;%S" UTC)
-        message("::set-output name=timestamp::${current_date}")
+        message("::setOutput name=timestamp::${current_date}")
     - name: ccache cache files
       uses: actions/cache@v4
       with: