[Bug libstdc++/109162] C++23 improvements to std::format

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109162
Bug 109162 depends on bug 111826, which changed state.

Bug 111826 Summary: __cpp_lib_format should be 202110, not 202106
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111826

           What    |Removed                     |Added
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             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED