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58807b29 - Server: Use `min` instead of `max` to limit the number of threads (#17421)

Server: Use `min` instead of `max` to limit the number of threads (#17421) ## Summary Prevent overcommit by using max 4 threads as intended. Unintuitively, `.max()` returns the maximum value of `self` and the argument (not limiting to the argument). To limit the value to 4, one needs to use `.min()`. https://doc.rust-lang.org/std/cmp/trait.Ord.html#method.max