docs: update supported compiler versions to match the C++17 requirement

[DiamonDinoia]

The listed versions (MSVC 2015 update 2, g++ 4.9, clang 4.0/3.7) predate C++17 and cannot compile the library. Minimum versions with full C++17 language support per the official compiler documentation.

[Alex-PLACET]

I propose to reference those we have in the CI:
gcc 10
clang 16
MSVC 2022
If we plan to support older compilers, we should add them in the CI

[DiamonDinoia]

I have no problem with that. I personally dislike maintaining very old compilers but I leave htis decisions to you all.

[JohanMabille]

It's indeed complicated to maintain compilers that we don't test in the CI, so I agree with Alexis, let's require those from the CI as minimal versions

[DiamonDinoia]

We can always say something like xsimd should work with any c++17 compiler, however we ufficially support (the ones tested in CI).

…

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