build: Update GutenbergKit integration

[dcalhoun]

Related

• ci: Distribute iOS artifacts via CI GutenbergKit#45

Description

Update GutenbergKit integration to download artifacts via the Swift plugin.

To test: TBD

Regression Notes

1. Potential unintended areas of impact
   TBD
2. What I did to test those areas of impact (or what existing automated tests I relied on)
   TBD
3. What automated tests I added (or what prevented me from doing so)
   TBD

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Testing checklist:

• WordPress.com sites and self-hosted Jetpack sites.
• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• VoiceOver.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• iPhone and iPad.
• Multi-tasking: Split view and Slide over. (iPad)

[dangermattic]

	1 Warning
⚠️	Modules/Package.swift was changed without updating its corresponding Package.resolved. Please resolve the Swift packages as appropriate to your project setup (e.g. in Xcode or by running swift package resolve).

	1 Message
📖	This PR is still a Draft: some checks will be skipped.

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