update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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# Locally computed:
sha256    92fbefdf18d45147c2b78ca2ce2d899d4d1da5a3391a4ff6c51a5b14c6d6f87c    lowpan-tools-0.3.1.tar.gz
sha256    ab15fd526bd8dd18a9e77ebc139656bf4d33e97fc7238cd11bf60e2b9b8666c6    COPYING