chore: build logs polluted with deprecation warnings on GarbageCollector.h

```
/OpenRV/src/lib/mu/Mu/Mu/GarbageCollector.h:280:26: warning: 'char_traits' is deprecated: char_traits for T not equal to char, wchar_t, char8_t, char16_t or char32_t is non-standard and is provided for a temporary period. It will be removed in LLVM 19, so please migrate off of it. [-Wdeprecated-declarations]
```

Start at Mu/Mu/GarbageCollector.h:280 and inspect the code producing the char_traits deprecation warning. Rebuild the affected target to confirm the warning is addressed; done means the build logs no longer report this warning.

Written by the indexing model from the issue text.