[BUG] Ender 5 Plus Bigtree SKR 3 configuration needs README update to point to correct display firmware.

Nobody has claimed this yet.

### Did you test the latest `bugfix-2.1.x` code?

Yes, and the problem still exists.

### Bug Description

The latest version of the [DGUS Reloaded](https://github.com/MarlinFirmware/Configurations/raw/bugfix-2.1.x/config/examples/Creality/Ender-5%20Plus/DGUS-Reloaded/DWIN_SET.tar.gz) display driver does not work with the 2.1.2.5 (and likely older configs). If you use that version of Marlin with the version of the display firmware pointed to in the README the temperatures will read off by 10x. So it will read as 2.2 C when it should be 22 C. I am not sure where the zip for the previous version of the driver is or I would make a PR to update it in the documentation.

### Bug Timeline

Started with latest update to DGUS Reloaded

### Expected behavior

I think either a link to an older compatible display firmware version or a note about the issue in the readme would be sufficient. The updates in that latest version of the firmware are awesome and in my opinion it is best to just go to the bugfix version.

### Actual behavior

The instructions lead the user to using an incompatible versions that are tricky to debug.

### Steps to Reproduce

Build the provided config for the Ender 5 plus with Marlin 2.1.2.5 using the original display as described in the readme.

### Version of Marlin Firmware

2.1.2.5

### Printer model

Ender 5 plus

### Electronics

BTT SKR 3 EZ

### LCD/Controller

DWIN T5UID1

### Other add-ons

_No response_

### Bed Leveling

None

### Your Slicer

None

### Host Software

None

### Don't forget to include

- [X] A ZIP file containing your `Configuration.h` and `Configuration_adv.h`.

### Additional information & file uploads

Config was updated for my stepper drivers and the SKR EZ mainboard.
[Configuration.zip](https://github.com/user-attachments/files/18326879/Configuration.zip)

Start with the Ender 5 Plus README instructions and the linked DGUS Reloaded display firmware archive. Verify which firmware is compatible with the Marlin 2.1.2.5 configuration and update the README with a compatible link or warning; done means the instructions no longer direct users to firmware that causes temperatures to read 10x too low.

Written by the indexing model from the issue text.