Fetch ZIPFoundation with SwiftPM instead of CocoaPods

[mokagio]

Fix

This is part of our effort to move away from CocoaPods, which is now in maintenance mode, in favor of Swift Package Manager. See https://linear.app/a8c/issue/AINFRA-448.

Test

I made sure the app built locally.

Review

Only one developer required to review these changes, but anyone can perform the review.

Release

These changes do not require release notes.

[mokagio]

I used exact to match the version resolved in Podfile.lock and avoid introducing changes because of fetching a newer version (at the time of writing, the latest is 0.9.19).

We can always follow up with a dedicated PR to update.

[wpmobilebot]

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

	App Name	Simplenote Prototype Build
	Build Number	1287
	Version	PR #1713
	Bundle ID	com.codality.NotationalFlow.Alpha
	Commit	bb8ba9c
	Installation URL	13b2qmci4onq8

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[AliSoftware]

The UI Tests CI job is failing because it seems it doesn't find the JSON used to handle test accounts used for those UI Tests

This seems unrelated to the changes in this PR and more likely related to the URL we used to store those not being valid anymore (hence the body of the request being just the text Not Found instead of the expected JSON, leading to JSON parsing error)

The value of UI_TESTS_ACCOUNTS_JSON_URL env var—as provided via .mobile-secrets—is a URL to https://kvdb.io/<someid>/… so I guess maybe our subscription to that service expired or something? (though I haven't found credentials for such service in Secret Store, so unable to verify)