[Bug]: Compile break for chrono timepoint formatting for macOS target < 13.3 and Xcode 15.3

### Describe the issue

Problem:
With the latest version of Xcode 15.3 it is no longer possible to use chrono timpoints in a test assertion, if the build target is lower than macOS 13.3. With Xcode 15.0.1 (and possibly later) this worked.
The macOS SDK made the `std::to_chars` function available with macOS 13.3, which seems to be involved when formatting the timepoints for printing.
Before that, Google Test maybe used a workaround for formatting that's no longer necessary for newer targets? This workaround is still needed for older deployment targets.

### Steps to reproduce the problem

I've created an example project [here](https://github.com/wAuner/gtest_macos_build_break). The build breaks with Xcode 15.3 when the deployment target is set below 13.3, which wasn't a problem with Xcode 15.0.1.

```cmake
CMakeLists.txt

cmake_minimum_required(VERSION 3.14)
# build fails if deployment target is set below 13.3
set(CMAKE_OSX_DEPLOYMENT_TARGET "14.0")
set(CMAKE_CXX_STANDARD 20)

project(gtest_issue)

include(FetchContent)
FetchContent_Declare(
googletest
URL https://github.com/google/googletest/archive/5197b1a8e6a1ef9f214f4aa537b0be17cbf91946.zip # latest commit
# URL https://github.com/google/googletest/archive/f8d7d77c06936315286eb55f8de22cd23c188571.zip # 1.14 release
)

FetchContent_MakeAvailable(googletest)

enable_testing()

add_executable(gtest_issue macostest.cpp)
target_link_libraries(gtest_issue gtest_main)

include(GoogleTest)
gtest_discover_tests(gtest_issue)
```

```cpp
#include
#include

TEST(ChronoTest, CompileBreakBelowMacOS133) {

auto t1 = std::chrono::system_clock::now();
ASSERT_EQ(t1, t1);
}

TEST(ChronoTest, Success) {

auto t1 = std::chrono::system_clock::now();
ASSERT_EQ(t1.time_since_epoch().count(), t1.time_since_epoch().count());
}
```

The deployment target of the mach-o can be verified via `otool -l gtest_issue | grep -A 4 LC_BUILD_VERSION `

### What version of GoogleTest are you using?

latest commit `5197b1a8e6a1ef9f214f4aa537b0be17cbf91946`

### What operating system and version are you using?

macOS 14.4.1
Xcode 15.3 (macOS SDK 14.4)

### What compiler and version are you using?

```
clang --version
Apple clang version 15.0.0 (clang-1500.3.9.4)
Target: arm64-apple-darwin23.4.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
```

### What build system are you using?

Xcode / cmake

### Additional context

_No response_