LWG4015 LWG 3973 broke const overloads of std::optional monadic operations

[jwakely]

https://cplusplus.github.io/LWG/issue4015

https://wg21.link/optional.monadic

[bstamour]

Poll: Accept the resolution in LWG4015 and move to immediate.

F	A	N
9	0	0