set upper bound in cmake_minimum_required #4776
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setting an upper bound improves forward-compatibility as legacy version support is dropped - 3.5 compat is deprecated in 3.27 (2023), removed in 4.0 (2025) - 3.10 compat is deprecated in 3.31 (2024)
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setting an upper bound improves forward-compatibility as legacy version support is dropped. Without an upper bound, the minimum version is used as the policy version, which means that setting a version lower than 3.5 will result in warnings starting with cmake 3.27 and errors starting in 4.0 (release candidate out now). This change allows zeromq to build with cmake 4.