chore(deps): update module mitchellh/mapstructure to v1.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/mitchellh/mapstructure	require	minor	v1.3.3 -> v1.4.0

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Release Notes

mitchellh/mapstructure

### [`v1.4.0`](https://togithub.com/mitchellh/mapstructure/compare/v1.3.3...v1.4.0) [Compare Source](https://togithub.com/mitchellh/mapstructure/compare/v1.3.3...v1.4.0)

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