Update add-path to use GitHub's new style

Author: RobertBlackhart

.github/workflows/on_pull_request.yml

@@ -10,7 +10,7 @@ jobs:
         run: |
           mkdir -p $HOME/bin
           curl -sfL https://raw.githubusercontent.com/reviewdog/reviewdog/master/install.sh | sh -s -- -b $HOME/bin
-          echo ::add-path::$HOME/bin
+          echo "$HOME/bin" >> $GITHUB_PATH
           python3 -m pip install setuptools
           python3 -m pip install pylint
           python3 -m pip install netapp-ontap