update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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# Locally calculated
sha256  a2fba4c6d9332ecc5f04283f370d5c275f35d6cb62dba1f685d011269bacb6d0  odroidc2-firmware-s905_6.0.1_v5.5.tar.gz