Use cppcheck 2.6 instead of default

[lefticus]

No description provided.

[codecov]

Codecov Report

Merging #7 (9adb1b2) into main (78b075c) will increase coverage by 9.51%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
+ Coverage   64.49%   74.00%   +9.51%     
==========================================
  Files           8        5       -3     
  Lines         414      277     -137     
  Branches      256        0     -256     
==========================================
- Hits          267      205      -62     
  Misses         72       72              
+ Partials       75        0      -75     

Flag	Coverage Δ
Linux	?
Windows	74.00% <ø> (ø)
macOS	?

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Impacted Files	Coverage Δ
include/json2cpp/constexpr_json.hpp	76.74% <0.00%> (-1.83%)	⬇️
include/json2cpp/json2cpp_adapter.hpp	58.40% <0.00%> (-0.23%)	⬇️
test/constexpr_tests.cpp	100.00% <0.00%> (ø)
src/json2cpp.hpp
src/json2cpp.cpp
src/main.cpp
test/valijson_tests.cpp	100.00% <0.00%> (+10.00%)	⬆️

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