Possible race condition in `observerCount`

[olejnjak]

ReactiveLocation contains a possible race condition, locking in observerCount.didSet is not sufficient. Inside synchronised block other thread can mutate the observerCount property and the behaviour might become undefined. Each access to observerCount property should be synchronised.

https://github.com/AckeeCZ/ReactiveLocation/blob/27939a414c9ac2cdbdf35debd4bfd2c7d4e51196/ReactiveLocation/ReactiveLocation.swift#L34

[github-actions[bot]]

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