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Update MigratingTo1.19.md

Bump GitHub Actions CI to Xcode 16.2 (pointfreeco#3549)

* Bump GitHub Actions CI to Xcode 16.2

16.0 was EOL'd on January 6.

* wip

* wip

Fix typo in migration doc.

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Fix crash when cancelling subscription for custom PersistenceKey (poi…

…ntfreeco#3494)

* Add crashing unit test for AppStorageKey subscription cancellation

* Fix double cancellation of Shared.Subscription

AppStorage: add support for Date values (pointfreeco#3470)

Co-authored-by: Stephen Celis <stephen@stephencelis.com>

Fix race conditions in CurrentValueRelay (pointfreeco#3447)

* Test

tweak test

tweaks

* Slow fix

* Fix test compilation

* nonrecursive lock

* back to os_lock

* undo renaming

* visibility

* Feedback

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Co-authored-by: Stephen Celis <stephen@stephencelis.com>

Infrastructure: Address concurrency warnings in tests (pointfreeco#3438)

* Infrastructure: Address concurrency warnings in tests

* wip

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Co-authored-by: Brandon Williams <mbrandonw@hey.com>

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