qiskit-aer
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Update cpp deps
Summary
Update header-only C++ libraries spdlog and nlohmann_json to more recent versions.
This is just to quickly test if something breaks using the GitHub Actions tests.
Details and comments
Current fixed versions for nlohmann_json and spdlog are about 7 years and 3 years old, respectively. This PR simply updates this versions to more recent versions. The latest versions of nlohmann_json is used. The latest version of spdlog cannot be used because it was released after Conan Center stopped updates for Conan 1.x last November.
Maybe this will make issues such as #1742 visible in GitHub CI as well.