[cpp.predefined] P2582R1 CTAD from inherited constructors should bump `__cpp_deduction_guides`

[frederick-vs-ja]

Full name of submitter (unless configured in github; will be published with the issue): Jiang An (Patrick Palka for the original issue)

Reference (section label): [cpp.predefined]

Link to reflector thread (if any): Originally posted in cplusplus/draft#6779.

Issue description:

We bumped __cpp_deduction_guides for class template argument deduction for alias templates and aggregate classes in C++20. As CTAD is furtherly enhanced in C++23 by P2582R1, we should bump the feature-test macro again.

Suggested resolution:

Modify Table 22 Feature-test macros [tab:cpp.predefined.ft] as indicated

Macro name	Value
[...]	[...]
__cpp_deduction_guides	201907L 202207L
[...]	[...]

[jensmaurer]

@tkoeppe , can you handle this editorially?

[tkoeppe]

No objection from me, that seems fine as editorial - probably the most valuable feedback we could get here is from implementers, who I assume have the most relevant view on how valuable this bump is.