fix(g4): RAM size of G491 & G4A1 is 112k not 128k (fixes #2835) #2837
      
        
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Summary
This PR fixes the following bugs:
Explain the motivation for making this change. What existing problem does the pull request solve?
Change .upload.maximum_data_size parameter in boards.txt to 114688 for STM32G491 and STM32G4A1, according to https://www.st.com/en/microcontrollers-microprocessors/stm32g4x1/products.html both parts are 112k RAM.
Validation
Demonstrate the code is solid. [e.g. Provide a sketch]Code formatting
Closing issues
Fixes #2835