build(deps): bump apache-airflow in /requirements/extras

Bumps [apache-airflow](https://github.com/apache/airflow) from 2.3.4 to 2.4.0.
- [Release notes](https://github.com/apache/airflow/releases)
- [Changelog](https://github.com/apache/airflow/blob/main/RELEASE_NOTES.rst)
- [Commits](apache/airflow@2.3.4...2.4.0)

---
updated-dependencies:
- dependency-name: apache-airflow
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements/extras/test_requirements.txt

@@ -11,7 +11,7 @@ contextlib2==21.6.0
 awslogs==0.14.0
 black==22.3.0
 stopit==1.1.2
-apache-airflow==2.3.4
+apache-airflow==2.4.0
 apache-airflow-providers-amazon==4.0.0
 attrs==22.1.0
 fabric==2.6.0