updating nlohmann_json to v3.12.0.

Author: gpx1000

attachments/CMake/Findnlohmann_json.cmake

@@ -47,7 +47,7 @@ if(NOT nlohmann_json_INCLUDE_DIR)
   FetchContent_Declare(
     nlohmann_json
     GIT_REPOSITORY https://github.com/nlohmann/json.git
-    GIT_TAG v3.11.2  # Use a specific tag for stability
+    GIT_TAG v3.12.0  # Use a specific tag for stability
   )
 
   # Set policy to suppress the deprecation warning

attachments/CMake/Findtinygltf.cmake

@@ -16,11 +16,11 @@
 find_package(nlohmann_json QUIET)
 if(NOT nlohmann_json_FOUND)
   include(FetchContent)
-  message(STATUS "nlohmann_json not found, fetching from GitHub...")
+  message(STATUS "nlohmann_json not found, fetching v3.12.0 from GitHub...")
   FetchContent_Declare(
     nlohmann_json
     GIT_REPOSITORY https://github.com/nlohmann/json.git
-    GIT_TAG v3.11.2  # Use a specific tag for stability
+    GIT_TAG v3.12.0  # Use a specific tag for stability
   )
   FetchContent_MakeAvailable(nlohmann_json)
 endif()