update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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# computed by luarocks/buildroot
sha256 42436ba2b78c9a2d515d6da59ceb12cdea7f84c9ce3c859d91addb42badd4061  lua-zlib-1.2-0.src.rock