Remove Python 2 support for utils/json.py

[BryceGattis]

[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

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

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.