clean: Replace scalaj with sttp

[lolgab]

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +9.55% (target: -1.00%)	✅ 37.50%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (161c45f)	741	561	75.71%
Head commit (d8df60c)	380 (-361)	324 (-237)	85.26% (+9.55%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#496)	8	3	37.50%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[DMarinhoCodacy]

LGTM!