[FIX/#107] cal, chat/multipart request 변경 - #108

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-java@v4, gradle/actions/setup-gradle@af1da67850ed9a4cedd57bfd976089dd991e2582. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Failed to restore gradle-home-v1|Linux-X64|build[b8a35c2f917259958c9abe8f2ff1b5ff]-672b1499f7997daf7045896aeddba44ef0a1fdb8: Error: Cache service responded with 400