Concurrent CLI commands prompt for unlock multiple times

I'm building some tooling that calls the `op` cli - which then talks to the Desktop app. If I call several commands in succession, I am only prompted to unlock once, and subsequent calls are authorized.  However if I call the commands in parallel, I will be re-prompted to unlock multiple times.

I realize it may be tricky, but even when requests are made in parallel, your app should be able to detect it and wait for the first unlock to finish before checking whether to show the unlock again.

Please fix!