Update deps and fix several issues

[brycekahle]

• Update min go version to 1.25
• Update dependencies
• Use unsafe.Slice instead of custom makeSlice
• Use unix.Setsockopt* and unix.Getsockopt* functions instead of custom versions
• Fix htons to handle big-endian systems
• Fix VLAN handling to check status bit first
• Fix TPacketV3 block advancement to increment by block size NOT frame size * num frames per block (they don't have to be equal)
• Fix TPacketV3 packet advance to always use tp_next_offset (all code I could find does this)
• Fix unsafe.Pointer usage to conform to allowed patterns.
• Minor style issues