[202305] Use json.hpp from nlohmann-json-dev instead of from swss-common (#2900)

[kcudnik]

• Use json.hpp from nlohmann-json-dev instead of from swss-common

This header file comes from an external package, and a very old version of the header file has been checked into swss-common. This will cause problems for the upcoming Bookworm upgrade.

Change references to the header file to use the Debian package nlohmann-json-dev, instead of from swss-common.

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