Bump mini_racer from 0.2.5 to 0.2.6
Bump mini_racer from 0.2.5 to 0.2.6

Bumps [mini_racer](https://github.com/discourse/mini_racer) from 0.2.5 to 0.2.6.
- [Release notes](https://github.com/discourse/mini_racer/releases)
- [Changelog](https://github.com/discourse/mini_racer/blob/master/CHANGELOG)
- [Commits](https://github.com/discourse/mini_racer/commits)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
spark-solutions/spark-starter-kit,spark-solutions/spark-starter-kit,spark-solutions/spark-starter-kit