Reimplement (C++23) deprecated std::aligned_storage

[ecatmur]

cf. #2535

[klemens-morgenstern]

Why not just use boost::aligned_storage ?

[codecov]

Codecov Report

Merging #2680 (90e1cc2) into develop (b0996f0) will increase coverage by 0.00%.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2680   +/-   ##
========================================
  Coverage    92.96%   92.97%           
========================================
  Files          177      177           
  Lines        13651    13658    +7     
========================================
+ Hits         12691    12698    +7     
  Misses         960      960           

Impacted Files	Coverage Δ
include/boost/beast/core/detail/type_traits.hpp	100.00% <ø> (ø)
include/boost/beast/websocket/detail/decorator.hpp	91.46% <ø> (ø)

... and 2 files with indirect coverage changes

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