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As noted in #20794 the parts of libiserv and iserv-proxy depend on network, therefore are never built nor tested during CI. Due to this iserv-proxy had bitrotted due to the bound on bytestring being out of date. Given we don't test this code it seems undesirable to distribute it. Therefore, it's removed and an external maintainer can be responsible for testing it (via head.hackage if desired). Fixes #20794
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