clean: Avoid depending on two json libraries

[lolgab]

Remove ujson dependency

[codacy-production[bot]]

Coverage summary from Codacy

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Coverage variation	Diff coverage
:white_check_mark: +0.26% (target: -1.00%)	:white_check_mark: ∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (9cc735f195b8f93c2ce2da4037a1c59f6c87ce4a) | 380 | 343 | 90.26% | | | Head commit (aadbb50eeacf8a41ab12e93ed18dfb6caa04c299) | 380 (+0) | 344 (+1) | 90.53% (**+0.26%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#495) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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