ci: Use GITHUB_OUTPUT envvar instead of set-output command (#1526)

Co-authored-by: Matt White <16320656+matt-FFFFFF@users.noreply.github.com>

.github/workflows/update-alz-tools.yml

@@ -81,7 +81,7 @@ jobs:
         run: |
           mapfile -t CHECK_GIT_STATUS < <(git status -s)
           printf "%s\n" "${CHECK_GIT_STATUS[@]}"
-          echo "::set-output name=changes::${#CHECK_GIT_STATUS[@]}"
+          echo "changes=${#CHECK_GIT_STATUS[@]}" >> "$GITHUB_OUTPUT"
 
       - name: Add files, commit and push
         if: steps.git_status.outputs.changes > 0