build(deps): bump the pip group across 1 directory with 2 updates

Bumps the pip group with 2 updates in the / directory: [apache-airflow](https://github.com/apache/airflow) and [apache-airflow-providers-slack](https://github.com/apache/airflow).


Updates `apache-airflow` from 2.9.3 to 2.10.3
- [Release notes](https://github.com/apache/airflow/releases)
- [Changelog](https://github.com/apache/airflow/blob/main/RELEASE_NOTES.rst)
- [Commits](apache/airflow@2.9.3...2.10.3)

Updates `apache-airflow-providers-slack` from 8.7.1 to 8.9.0
- [Release notes](https://github.com/apache/airflow/releases)
- [Changelog](https://github.com/apache/airflow/blob/main/RELEASE_NOTES.rst)
- [Commits](apache/airflow@providers-slack/8.7.1...providers-slack/8.9.0)

---
updated-dependencies:
- dependency-name: apache-airflow
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: pip
- dependency-name: apache-airflow-providers-slack
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <[email protected]>