Replace deprecated set-output command

Author: sjinks

deploy.sh

@@ -159,7 +159,7 @@ if $INPUT_GENERATE_ZIP; then
   echo "Generating zip file..."
   cd "$SVN_DIR/trunk" || exit
   zip -r "${GITHUB_WORKSPACE}/${SLUG}.zip" .
-  echo "::set-output name=zip-path::${GITHUB_WORKSPACE}/${SLUG}.zip"
+  echo "zip-path=${GITHUB_WORKSPACE}/${SLUG}.zip" >> "${GITHUB_OUTPUT}"
   echo "✓ Zip file generated!"
 fi