6.5.2 Firmware for CORE ONE L

Based on https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.5.2

The firmware with websocket suffix uses the newest websocket implementation for communicating with server. This allows more responsive communication, but also requires updating the integration-prusa-connect server to the newest version.
And the firmware with the basic suffix uses the usual communication, and thus works with all versions