Auto-update Sentry Cocoa

[jpnurmi]

question: should we verify the SHA256 file hash ... and is there a way to auto-upgrade / auto-bump this as well?

Originally posted by @Flash0ver in #4411 (comment)

[linear]

NET-406 Auto-update Sentry Cocoa

[jpnurmi]

sentry-cocoa updates had been stuck since #3786

I deleted the old manually modified deps/scripts/update-cocoa.ps1 branch to re-activate the updater script.

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