Update coremark screenshot

Author: object-Object

README.md

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 RISC-V processor in Mindustry logic. Requires the bleeding edge version of Mindustry (for `printchar`).
 
-![image](https://github.com/user-attachments/assets/8ce01112-e908-49ab-9697-8d8d0a3fcdbd)
+![image](https://github.com/user-attachments/assets/3951b4b7-cc56-494a-85f8-54bd9f2ee7d5)
 
 ## System calls