Update github4s to 0.30.0

[47erbot]

Updates com.47deg:github4s from 0.28.5 to 0.30.0.
GitHub Release Notes - Changelog - Version Diff

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labels: library-update, semver-minor

Closes #653

[jisantuc]

Two changes required here:

• github4s upgrade pulls in later cats-effect, which requires upgraded http4s-blaze-client
• dependencies.sbt (used in plugin's contribution to its own build) and build.sbt need to have compatible versions of things, or the build breaks in hilarious ways (you can't fire up sbt to test changes in build.sbt out because the project can't load, and the project needs... itself? snake-eating-its-own-tail.gif)

outside of that it's a standard CE3 upgrade