This picks up one of the changes from #29232, which is a switch to building libnatpmp with CMake. It includes an update to the most recent version of libnatpmp (https://github.com/miniupnp/libnatpmp/commit/f2433bec24ca3d3f22a8a7840728a3ac177f94ba), which includes (https://github.com/miniupnp/libnatpmp/pull/43).
From an initial look I couldn’t find any significant difference between the Autotools and CMake produced libs.