Update .swiftformat

Update Swift version and platform targets (#10)

Allow Locked to store non-Sendable elements (#9)

Add `Locked` (#8)

- Add `Locked<Element>` to make it easier to ensure mutable state is only accessed safely
- Add `bin/format.sh`

Remove SynchronizedDynamic (#7)

Add SynchronizedDynamic dynamic library

Improve deinit (#6)

Version 2.1.0 (#5)

Remove synchronized and expose Lock and RecursiveLock (#4)

* Remove synchronized and expose Lock and RecursiveLock

* Add tests for tryLocked

Reduce locking during queue cleanup (#3)