Patch CVE-2024-24792

[ingve]

Fixes

=== Symbol Results ===

Vulnerability #1: GO-2024-2937
    Panic when parsing invalid palette-color images in golang.org/x/image
  More info: https://pkg.go.dev/vuln/GO-2024-2937
  Module: golang.org/x/image
    Found in: golang.org/x/image@v0.16.0
    Fixed in: golang.org/x/image@v0.18.0
    Example traces found:
      #1: internal/docs/docs.go:48:27: docs.RenderMarkdown calls term.Render, which eventually calls tiff.Decode

Your code is affected by 1 vulnerability from 1 module.