c++: Fix std dialect hint for std::to_address [PR107800]

The correct dialect for std::to_address is cxx20 not cxx11.

gcc/cp/ChangeLog:

	PR libstdc++/107800
	* cxxapi-data.csv <to_address>: Change dialect to cxx20.
	* std-name-hint.gperf: Regenerate.
	* std-name-hint.h: Regenerate.