Flags().Uin64P broken

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ToUintE() fails to parse uint bigger than math.MaxInt64 in the cast dependancy. This prevents people from using numbers like macOS kernel addresses as arguents to cobra:

example:

❯ ipsw macho disass test-caches/IPSWs/20C5058d__iPhone15,2/kernelcache.release.iPhone15,2 -a 0xFFFFFFF008493FE0 -V --fileset-entry com.apple.AGXFirmwareKextG15P_A0RTBuddy

fails because it thinks I entered 0 as the --vaddr (virtual address) to be disassembled

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spf13/cobra#1869

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My apologies, this is a viper issue, not a pflag issue!