Use environment file for output

Author: djdefi

.github/workflows/rsync-docker-bump.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Get latest rsync tag
         id: latest_tag
         run: |
-          curl --silent "https://api.github.com/repos/WayneD/rsync/tags" | jq -r '.[].name' | grep -m1 -v pre | xargs -I {} echo "::set-output name=latest_tag::{}"
+          curl --silent "https://api.github.com/repos/WayneD/rsync/tags" | jq -r '.[].name' | grep -m1 -v pre | xargs -I {} echo "name=latest_tag::{}" >> $GITHUB_OUTPUT
 
       - name: Update Dockerfile with latest tag
         run: |