update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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# locally computed
sha256  2cfeb6a9236e1a743c8010f05e504dbc92169ef42d9a6cf7948954a577bfc386  DataflashBoot-1.05.tar.bz2