std::aligned_storage is deprecated in c++23

[christianbrugger]

When using folly with Clang and C++23 I get deprecation warnings when using folly::small_vector.

When I use -Werror on my code, the build fails.

/app/./folly/Traits.h:502:1: error: 'aligned_storage<4, 4>' is deprecated 
                            [-Werror,-Wdeprecated-declarations]
  502 | using aligned_storage_for_t =
      | ^
/opt/compiler-explorer/gcc-14.2.0/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../
                            include/c++/14.2.0/type_traits:2182:5: note: 
                            'aligned_storage<4, 4>' has been explicitly marked deprecated here
 2182 |     _GLIBCXX23_DEPRECATED
      |     ^
/opt/compiler-explorer/gcc-14.2.0/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../
                            include/c++/14.2.0/x86_64-linux-gnu/bits/c++config.h:139:34: 
                            note: expanded from macro '_GLIBCXX23_DEPRECATED'
  139 | # define _GLIBCXX23_DEPRECATED [[__deprecated__]]
      |                                  ^
1 error generated.

https://godbolt.org/z/76rcdcz63

[gedanziger]

This paper (supporting deprecation of aligned storage) actually mentioned folly: https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1413r3.pdf