GitHub Actions: Deprecating set-output commands

Author: Sherry520

.github/workflows/release-on-merge.yml

@@ -17,8 +17,8 @@ jobs:
         echo Computing next tag number
         LASTPATCH=$(git describe --tags | cut -d- -f1 | cut -d. -f3)
         PATCH=$(($LASTPATCH+1))
-        echo "::set-output name=tagname::2.1.${PATCH}"
-        echo "::set-output name=branch::${GITHUB_REF#refs/heads/}"
+        echo "tagname=2.1.${PATCH}" >> $GITHUB_OUTPUT
+        echo "branch=${GITHUB_REF#refs/heads/}" >> $GITHUB_OUTPUT
 
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1