danielaparker::jsoncons traits fail with version >=1.5.0 of jsoncons

Start in include/jwt-cpp/traits/danielaparker-jsoncons/traits.h, focusing on the jsoncons::json_type names shown in the compiler errors. Compare them with the referenced jsoncons upstream commit, then verify that the traits compile with jsoncons 1.5.0 or newer on GCC/Linux.

What happened?

Upstream has deprecated the type names int64_value etc. in 1.5.0, they are now just int64, leading to errors such as:

/var/tmp/portage/dev-cpp/jwt-cpp-0.7.2/work/jwt-cpp-0.7.2/include/jwt-cpp/traits/danielaparker-jsoncons/traits.h:125:72: error: ‘bool_value’ is not a member of ‘jsoncons::json_type’
  125 |                                 if (val.type() == jsoncons::json_type::bool_value) return type::boolean;
      |                                                                        ^~~~~~~~~~
/var/tmp/portage/dev-cpp/jwt-cpp-0.7.2/work/jwt-cpp-0.7.2/include/jwt-cpp/traits/danielaparker-jsoncons/traits.h:126:72: error: ‘int64_value’ is not a member of ‘jsoncons::json_type’
  126 |                                 if (val.type() == jsoncons::json_type::int64_value) return type::integer;
      |                                                                        ^~~~~~~~~~~

Relevant upstream commit:
https://github.com/danielaparker/jsoncons/commit/f070f9566a897fbdc7603553d960cf1907cdd72d

How To Reproduce?

Use jsoncons >= 1.5.0.

Version

0.7.2

What OS are you seeing the problem on?

Linux

What compiler are you seeing the problem on?

GCC

Relevant log output

/var/tmp/portage/dev-cpp/jwt-cpp-0.7.2/work/jwt-cpp-0.7.2/include/jwt-cpp/traits/danielaparker-jsoncons/traits.h:125:72: error: ‘bool_value’ is not a member of ‘jsoncons::json_type’
  125 |                                 if (val.type() == jsoncons::json_type::bool_value) return type::boolean;
      |                                                                        ^~~~~~~~~~
/var/tmp/portage/dev-cpp/jwt-cpp-0.7.2/work/jwt-cpp-0.7.2/include/jwt-cpp/traits/danielaparker-jsoncons/traits.h:126:72: error: ‘int64_value’ is not a member of ‘jsoncons::json_type’
  126 |                                 if (val.type() == jsoncons::json_type::int64_value) return type::integer;
      |                                                                        ^~~~~~~~~~~

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