fix(deps): alias image-size to image-size-next@1.2.2 (CVE-2025-71329/71330)

[lcf2212dev]

Why this PR

appdmg generates macOS DMG installers. On default master the published tarball depends on image-size@^0.7.4 and calls const sizeOf = require('image-size') in lib/appdmg.js so Finder-window background/icon layout can read PNG width/height.

Published appdmg@0.6.6 still depends on image-size@^0.7.4 (dependencies). Upstream image-size is archived. That coordinate remains affected by:

• CVE-2025-71329 / GHSA-5p2g-fcmc-qvqq — DoS via infinite loop on JXL/HEIF/JP2 zero-size boxes
• CVE-2025-71330 / GHSA-w3rx-r6r6-pgpr — DoS via infinite loop on ICNS zero entry length

There is no patched release on the original package name. npm audit fix cannot rename the coordinate. This PR is a one-line alias so installs stop fetching the vulnerable tarball.

Change

Alias the published 1.x runtime dependency:

- "image-size": "^0.7.4"
+ "image-size": "npm:image-size-next@1.2.2"

Call sites left untouched:

• test/lib/visually-verify-image.js:8 const sizeOf = require('image-size')
• lib/appdmg.js:9 const sizeOf = require('image-size')

image-size-next@1.2.2 is a MIT community fork with the same 1.x public API. Compare: lcf2212dev/image-size-next@v1.2.1...v1.2.2

This is the 1.x pin (CJS default-export require('image-size') / import sizeOf from 'image-size' (0.x/1.x). Do not use image-size-next@2.1.1 here (ESM+CJS 2.x named imageSize export).)

Note: image-size-next@1.2.2 declares engines.node >= 16. This package currently lists engines.node >=8.5. If you still need older Node, vendoring the size helper is the alternative; the original image-size line has no patched tarball on any Node version.

Hub: lcf2212dev/image-size-next#3

I maintain image-size-next and am not affiliated with the original image-size author, nor with this project. Happy to drop the alias if you prefer vendoring the size helper.

Test plan

• install resolves image-size → image-size-next@1.2.2
• existing require/import of image-size needs no source edits
• image width/height behaviour on the call sites above is unchanged