Bump apache-airflow from 1.10.2 to 1.10.6
Bump apache-airflow from 1.10.2 to 1.10.6

Bumps [apache-airflow](https://github.com/apache/airflow) from 1.10.2 to 1.10.6.
- [Release notes](https://github.com/apache/airflow/releases)
- [Changelog](https://github.com/apache/airflow/blob/1.10.6/CHANGELOG.txt)
- [Commits](https://github.com/apache/airflow/compare/1.10.2...1.10.6)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
GoogleCloudPlatform/oozie-to-airflow,GoogleCloudPlatform/oozie-to-airflow