Add support for ThinkPad T14 Gen 4

[physanus]

In #27, support for T14* was added to the branch feat/support_t14.
I compiled the binary according to the README, but the application still tells me that my device is unsupported.
Currently I am running Windows on a ThinkPad T14 Gen 4.

I am not familiar with Rust but I can help with debugging if you tell me what to do or provide some debug code.
@nikolareljin Maybe you can take a look at this since the code in the PR was initially developed by you?

Thank you!

[chnzzh]

If your device shows that it is unsupported, it means the tool failed to locate the relevant UEFI variable.

Here are a few steps you can take:

1. First, check your device's BIOS firmware (available for download from the official support website) to see if the relevant GUID value exists. you can use uefitool to search GUID value in firmware:
   871455D0-5576-4FB8-9865-AF0824463B9E
   871455D1-5576-4FB8-9865-AF0824463C9F

2. If not found the value, the firmware may not be Insyde vendor. In this case, this software is not supported to change logo (but the installation directory of bios update driver might contain official guides on modifying the logo by altering the BIOS firmware).

3. If the value does exist, your computer might simply be missing the variable, updating the firmware may resolve the issue?

Btw, you can omit the --release flag during compilation to display debug information.