Update module github.com/galaco/vtf to v1.2.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/galaco/vtf	v1.1.1 -> v1.2.0

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Release Notes

galaco/vtf (github.com/galaco/vtf)

v1.2.0: Improved support

Compare Source

• Refactored mipmap loading to read in reverse order (largest->smallest). This resolves a rare OOB error caused by an off-by-8bytes offset into mipmap data. This could be reproduced most easily with all 6 faces of the map de_dust2's skybox textures.
• Added quality of life functions to more easily fetch the 'first' texture (highest-resolution, first frame mipmap).
• Made return types for image data uniform (replaces instances of []byte with []uint8). These type changes are won't affect compatability.

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