update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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What:        /sys/class/net/<iface>/dsa/tagging
Date:        August 2018
KernelVersion:    4.20
Contact:    netdev@vger.kernel.org
Description:
        String indicating the type of tagging protocol used by the
        DSA slave network device.