Update dependency image-type to v6

This MR contains the following updates:

Package	Change	Age	Confidence
image-type	^3.0.0 -> ^6.0.0

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Release Notes

sindresorhus/image-type (image-type)

v6.0.0

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v5.2.0

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v5.1.0

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v5.0.0

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v4.1.0

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v4.0.0

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v3.1.0

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Configuration

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