FontSize has to be multiples of stepGranularity reopen

[sanchez-gonzalo94]

Steps to Reproduce

1. Install flutter_screenutil: ^5.9.3.
2. Set ScreenUtilInit as the parent widget on top of MaterialApp with a designSize.
3. Create a AutoSizeText widget and set minFontSize with '.sp' suffix (screenutil).
4. Returns error.

Code sample

AutoSizeText(
          "hello world",
          textAlign: TextAlign.center,
          minFontSize: 16.sp, ,
        )

Screenshots
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Version

• Flutter version: 3.22.6
• auto_size_text version:v3.0.0
• flutter_screenutil: ^5.9.3