You have this error:
libc6-dev : Breaks: libgcc-8-dev (< 8.4.0-2~) but 8.3.0-6+rpi1 is to be installed
Have a look at this workaround: Migration to 11 won't start : "libc6-dev : Breaks: libgcc-8-dev" - #43 by Aleks
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