Bump kotlin-gradle-plugin from 1.3.61 to 1.3.70 (#473)
Bump kotlin-gradle-plugin from 1.3.61 to 1.3.70 (#473)

Bumps [kotlin-gradle-plugin](https://github.com/JetBrains/kotlin) from 1.3.61 to 1.3.70.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/compare/v1.3.61...v1.3.70)

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

Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
line/line-bot-sdk-java,line/line-bot-sdk-java,line/line-bot-sdk-java,line/line-bot-sdk-java