Replace ::set-output with $GITHUB_OUTPUT

https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#environment-files

Author: jsoref

merge

@@ -1,8 +1,8 @@
 #!/bin/bash
 report_failure() {
     echo "MERGE_FAILED=1" >> "$GITHUB_ENV"
-    echo '::set-output name=status::failed'
-    echo "::set-output name=message::$1"
+    echo 'status=failed' >> "$GITHUB_OUTPUT"
+    echo "message=$1" >> "$GITHUB_OUTPUT"
     if [ -z "$INPUT_DO_NOT_REPORT" ]; then
         echo "::error ::$1"
     fi
@@ -39,4 +39,4 @@ GITHUB_HEAD_SHA=$(git rev-parse FETCH_HEAD)
 git merge -m "Merge $GITHUB_HEAD_SHA into $GITHUB_BASE_SHA" FETCH_HEAD ||
     report_failure "Can't generate merge; there's probably a conflict. Resolve it to get workflow feedback."
 
-echo '::set-output name=status::success'
+echo 'status=success' >> "$GITHUB_OUTPUT"