Fix #10378 - bump nlohmann/json to support most recent clang/apple-clang

[jmarrec]

Pull request overview

• Fixes std::char_traits is deprecated in clang 18 and removed in clang 19 #10378
• std::char_traits is deprecated in clang 18 and removed in clang 19, and in apple-clang 17.

Description of the purpose of this PR

This bumps nlohmann/json from 3.7.2 to 3.12.0 (latest), so that it keeps on compiling with the most recent clang.

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[jmarrec]

I think I need to bump valijson too for MSVC...

https://github.com/tristanpenman/valijson/releases/tag/v1.0.2

Update NlohmannJsonAdapter to make it compatible with latest NlohmannJson

• Update NlohmannJsonAdapter to make it compatible with latest NlohmannJson tristanpenman/valijson#177

[Myoldmopar]

not sure why C-style comments bad, but shush the check

Because we do lots of parsing the code sniffing out bad patterns and issues, and some of the parsing relies on a line-by-line analysis. And they don't keep track of multiline C style comments. So they could wreak havoc in those scripts. We can have discussions about it, but that's the real reason. If we want to allow them, we'll need to invest substantially to beef up our analysis scripts.

[jmarrec]

Meh, I'm fine with it, easier to just shush it than change the scripts!

[Myoldmopar]

Most excellent. Thanks @jmarrec !

[Myoldmopar]

All clean. @RKStrand merging this in now. Thanks @jmarrec .