Replace AsyncLock with SemaphoreSlim #22791
Merged
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And enable CA1001 (Types that own disposable fields should be disposable)
Note that the SemaphoreSlim doesn't actually get disposed - just like before. This isn't a problem because very few instances of HiLoValueGenerator are created in an application, and SemaphoreSlim generally only needs to be disposed if AvailableWaitHandle is called (though we shouldn't really be relying on that).