update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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# Locally calculated
sha256 ac952d89ae0fc3543e81099e7d34917efc621f5def112eee843fd1ce755eca8c  gcc-arm-9.2-2019.12-x86_64-arm-none-eabi.tar.xz