Bump kotlin_version from 1.4.10 to 1.4.20 (#2302)
Bump kotlin_version from 1.4.10 to 1.4.20 (#2302)

Bumps `kotlin_version` from 1.4.10 to 1.4.20.

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

Updates `kotlin-stdlib-jdk8` 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)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openhab/openhab.android