v0.13.1: Fix issue with sbt plugin cache key

tl;dr

There was an issue with v0.13.0 when builds using the sbt plugin had no colocated smithy files, but were pulling remote jars as dependencies. This release contains a fix for this.

What's Changed

• Update jsoniter-scala-core to 2.13.24 by @scala-steward in #220
• Fix sbt plugin regression by @lewisjkl in #221

Full Changelog: v0.13.0...v0.13.1