update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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# locally computed
sha256  63f6068ae36884adef4259bbb1fe2591755718f22c46d0a59d854883dfab1ffc  imx-bootlets-src-10.12.01.tar.gz