build(deps): bump kotlin-version from 1.4.10 to 1.4.20

Bumps `kotlin-version` from 1.4.10 to 1.4.20.

Updates `kotlin-bom` from 1.4.10 to 1.4.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.4.20/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/compare/v1.4.10...v1.4.20)

Updates `kotlin-maven-plugin` from 1.4.10 to 1.4.20

Signed-off-by: dependabot[bot] <support@github.com>
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