v0.12.2 : prevent duplicated rendering of package imports

What's Changed

• remove generation of redundant package imports by @lewisjkl in #102
• Update jsoniter-scala-core to 2.13.0 by @scala-steward in #99
• Update smithy-aws-traits, smithy-build, ... to 1.17.0 by @scala-steward in #96

Full Changelog: v0.12.1...v0.12.2