spdlog: updated to 1.14.0

Version 1.14.0

Updated bundled fmt to version 10.2.1.
Mapped Diagnostic Context (MDC) support
MDC is a simple map of key->string values stored in thread local storage whose content will be printed by the loggers.
Usage example:
#include "spdlog/mdc.h"
..
spdlog::mdc::put("mdc_key_1", "mdc_value_1");
spdlog::info("Hello, {}", "World!");  // => [2024-04-26 02:08:05.040] [info] [mdc_key_1:mdc_value_1] Hello, World!
Add milliseconds support to stopwatch
Add std::string_view overloads for logger accessor
Make async_logger::flush() synchronous - wait for the flush operation to complete before returning
Use _stat() on Windows to be more UTF8 friendly
Add details about how compile time macros work
Fix typos found by codespell
Expose the flusher thread object to user in order to allow setting of thread name and thread affinity when needed
Fix the problem of compilation failure under MINGW
Add missing include in circular_q.h
Don't remove previous defaullt logger from registry in set_default_logger.
Remove the legacy AnalyzeTemporaryDtors option from .clang-tidy.
Updated INSTALL.md has to better reflect compiler info
Fixed README.md example

(adam)