SofaMatrix should allow non-EXACT metis versions

[LunNova]

metis has published v5.2.1, the find_package EXACT call fails.

sofa/applications/plugins/SofaMatrix/CMakeLists.txt

Line 10 in 366f324

find_package(metis 5.1.0 EXACT QUIET)

https://github.com/KarypisLab/METIS/tags

METIS 5.1.0 was published in 2013 and is incompatible with CMake 4, so an EXACT requirement is inconvenient.