Update dependency image_optim to v0.31.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
image_optim (changelog)	0.31.3 -> 0.31.4

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Release Notes

toy/image_optim (image_optim)

v0.31.4

Compare Source

• Added --svgo-allow-lossy and --svgo-precision options to use svgo in lossy mode. This sets svgo --precision, which can result in substantially smaller svgs (see #​211 for some experiments). Lower values are more lossy. 3 is the default, but many SVGs will work well even with 0 or 1. Like all worker specific lossy flags, this is also enabled with --allow-lossy. #​210 #​211 @​gurgeous

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