build(deps): bump golang.org/x/image from 0.11.0 to 0.18.0

[dependabot[bot]]

Bumps golang.org/x/image from 0.11.0 to 0.18.0.

Commits

• 3bbf4a6 tiff: Validate palette indices when parsing palette-color images
• 6c5fa46 go.mod: update golang.org/x dependencies
• 55c4ab6 go.mod: update golang.org/x dependencies
• 0057a93 tiff: fix function name in comment
• 9e190ae webp: disallow multiple VP8X chunks
• 445ab0e go.mod: update golang.org/x dependencies
• 240a51a font/sfnt: support early version 0 OS/2 tables
• c20bbc3 draw: simplify some calls to fmt.Fprintf
• 491771c draw: merge draw_go117.go into draw.go
• 4aa0222 go.mod: update go directive to 1.18
• Additional commits viewable in compare view

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