Use GITHUB_OUTPUT instead of set-output (#25)

Co-authored-by: Milton Torasso <milton.torasso@kiwibot.com>

entrypoint.sh

@@ -3,4 +3,4 @@ PACKAGE_JSON_PATH="${1-.}"
 echo "Reading package.json from ${PACKAGE_JSON_PATH}/package.json"
 PACKAGE_VERSION=$(cat ${PACKAGE_JSON_PATH}/package.json | jq '.version' | tr -d '"')
 
-echo ::set-output name=current-version::$PACKAGE_VERSION
+echo "current-version=${PACKAGE_VERSION}" >> $GITHUB_OUTPUT