Use WIP version of CI toolkit with new install_swift_dependencies

[mokagio]

See Automattic/a8c-ci-toolkit-buildkite-plugin#105

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To test

Checklist

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

[dangermattic]

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[pocketcasts]

📲 You can test the changes from this Pull Request in Pocket Casts Prototype Build by scanning the QR code below to install the corresponding build.

	App Name	Pocket Casts Prototype Build
	Build Number	pr1998-affaaff
	Version	7.70
	Bundle ID	au.com.shiftyjelly.podcasts.prototype
	Commit	affaaff
	App Center Build	Pocket Casts - Prototype Builds #24

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