wifi: rtw89: usb: backport 80119a77e5b0 — fix TX flow control (RTL8851BU/8852BU USB AP data-path wedges) - #7648

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. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/