update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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config BR2_PACKAGE_SCRUB
    bool "scrub"
    help
      Scrub iteratively writes patterns on files or disk devices
      to make retrieving the data more difficult.
 
      https://github.com/chaos/scrub/