fast_float.h currently is only used by OBJ, STL and PLY I/O importers. Update it to the latest release from upstream (from 3.4.0 2020 Nov to 4.0.0 2023 Mar). No behavior changes, but they have optimized the performance a bit. Importing a 6-level subdivided Suzanne OBJ file (330MB) goes from 3.5sec down to 3.2sec on Win10, Ryzen 5950X, VS2022 build.
When updating a library remember to: * Update the README.blender with the corresponding version. * Update the THIRD-PARTY-LICENSE.txt document