update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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# Locally calculated after checking pgp signature
sha256  b782339fc7a38fe17689cb39966c4d821236c28018b6593ddb6fd59ee40786a8  gsl-2.6.tar.gz
sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING