add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

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#locally computed
sha256 55dd751c4c812809841fd06f4729b8341171c4b6c1dc28a9412455282554f8a5  micropython-v1.8.7.tar.gz