Swap mitchellh/mapstructure imports to go-viper/mapstructure/v2
ProprietaryRepoint every github.com/mitchellh/mapstructure import at github.com/go-viper/mapstructure/v2, the maintained fork. The package name is unchanged, so call sites stay as written; only the import path and its type attribution move. A file naming mapstructure.Error, the one export v2 dropped, is left alone — see FindMapstructureErrorUsage.
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