sync with boost.buffers changes

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[cppalliance-bot]

An automated preview of the documentation is available at https://168.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://168.http-proto.prtest.cppalliance.org/index.html

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.53%. Comparing base (d970216) to head (304181c).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #168      +/-   ##
===========================================
+ Coverage    92.51%   92.53%   +0.01%     
===========================================
  Files           80       81       +1     
  Lines         5079     5064      -15     
===========================================
- Hits          4699     4686      -13     
+ Misses         380      378       -2     

Files with missing lines	Coverage Δ
include/boost/http_proto/impl/sink.hpp	100.00% <100.00%> (+4.54%)	⬆️
include/boost/http_proto/impl/source.hpp	100.00% <100.00%> (ø)
include/boost/http_proto/serializer.hpp	100.00% <ø> (ø)
include/boost/http_proto/sink.hpp	100.00% <ø> (ø)
include/boost/http_proto/source.hpp	100.00% <ø> (ø)
src/detail/array_of_const_buffers.cpp	100.00% <100.00%> (ø)
src/detail/array_of_const_buffers.hpp	100.00% <ø> (ø)
src/detail/buffer_utils.hpp	100.00% <100.00%> (ø)
src/detail/filter.cpp	88.46% <100.00%> (ø)
src/detail/filter.hpp	100.00% <ø> (ø)
... and 4 more

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