Remove #include<boost/serialization/vector.hpp>.

[1uc]

The comments state the at some point boost serialization and boost numeric had an ordering requirement of certain headers.

It claimed:

// starting Boost 1.64, serialization header must come before ublas
#include <boost/serialization/vector.hpp>
#include <boost/numeric/ublas/matrix.hpp>

If this is still true then users must include the affected boost headers before including highfive/boost.hpp. However, we're no longer forcing the dependency onto all HighFive + Boost users.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7ba4849) 86.13% compared to head (236f000) 85.96%.
Report is 1 commits behind head on master.

❗ Current head 236f000 differs from pull request most recent head 8d2b175. Consider uploading reports for the commit 8d2b175 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #903      +/-   ##
==========================================
- Coverage   86.13%   85.96%   -0.18%     
==========================================
  Files          90       89       -1     
  Lines        5858     5870      +12     
==========================================
  Hits         5046     5046              
- Misses        812      824      +12     

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