Update and lock json version
What does this MR do and why?
Update and lock json version
In CI the tests are passing because it's using very old default json gem, while locally I am running something newer and it's broken. Locking the version should resolve this disparity.
Expected impact & dry-runs
These are strongly recommended to assist reviewers and reduce the time to merge your change.
See https://gitlab.com/gitlab-org/quality/triage-ops/-/tree/master/doc/scheduled#testing-with-a-dry-run on how to perform dry-runs.
Action items
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(If applicable) Add documentation to the handbook pages for Triage Operations => - (If applicable) Identify the affected groups and how to communicate to them:
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/cc @ person_or_group
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Relevant Slack channels => -
Engineering week-in-review
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