remove the free threaded nanobind build

Author: Griger5

CMakeLists.txt

@@ -546,7 +546,7 @@ endif()
 find_package(nanobind CONFIG REQUIRED)
 
 add_subdirectory(gitmodules/nanobind)
-nanobind_add_module(_PyPartMC FREE_THREADED STABLE_ABI ${PyPartMC_sources})
+nanobind_add_module(_PyPartMC STABLE_ABI ${PyPartMC_sources})
 add_dependencies(_PyPartMC partmclib)
 set(PYPARTMC_INCLUDE_DIRS 
   "${CMAKE_BINARY_DIR}/include;"