Remove Python 2 support for utils/json.py

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (main@9c8de33). Click here to learn what that means.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1673 +/- ## ======================================= Coverage ? 58.03% ======================================= Files ? 127 Lines ? 17069 Branches ? 3496 ======================================= Hits ? 9906 Misses ? 6496 Partials ? 667 ```

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