Update json4s-jackson, json4s-native to 3.6.12

[scala-steward]

Updates

• org.json4s:json4s-jackson
• org.json4s:json4s-native

from 3.5.5 to 3.6.12.

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

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labels: library-update, early-semver-minor, semver-spec-minor, commit-count:1

[rossabaker]

I don't know whether this is an GitHub flake or an sbt-typelevel flake. /cc @armanbilge

https://github.com/typelevel/jawn/runs/4859261390?check_suite_focus=true

[armanbilge]

Just a GH flake so far as I know, although could be an sbt-gh-actions thing.

I wonder if these steps should fail silently, because they are just caches and not critical.