Fix value_ref construction for const rvalues

[sdkrystian]

No description provided.

[codecov]

Codecov Report

Merging #64 into develop will decrease coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop      #64      +/-   ##
===========================================
- Coverage    99.28%   99.19%   -0.09%     
===========================================
  Files           58       57       -1     
  Lines         5042     5229     +187     
===========================================
+ Hits          5006     5187     +181     
- Misses          36       42       +6     

Impacted Files	Coverage Δ
include/boost/json/value_ref.hpp	100.00% <ø> (ø)
include/boost/json/impl/serializer.ipp	98.57% <0.00%> (-1.43%)	⬇️
include/boost/json/impl/basic_parser.ipp	99.55% <0.00%> (-0.45%)	⬇️
include/boost/json/serializer.hpp	100.00% <0.00%> (ø)
include/boost/json/detail/sse2.hpp	100.00% <0.00%> (ø)
include/boost/json/detail/config.hpp	100.00% <0.00%> (ø)
include/boost/json/detail/stream.hpp	100.00% <0.00%> (ø)
include/boost/json/detail/static_stack.hpp
include/boost/json/detail/impl/stack.ipp	100.00% <0.00%> (+12.50%)	⬆️

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[sdkrystian]

Fixed by fdee3ce