Fix race in LRU concurrent update and TryRemove(kvp)#616
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There is a lock in
TryUpdateto prevent concurrent updates, but no item lock onTryRemove(kvp). No lock is needed forTryRemove(key)because updates to the value do not affect the outcome - key should always be removed. The value is important in the kvp variant however (#371), where the equivalent lock was missed leading to a race when the value changes between finding the existing LruItem and removing it.