Bump apache-airflow from 2.5.3 to 2.7.3 in /src/tests

Bumps [apache-airflow](https://github.com/apache/airflow) from 2.5.3 to 2.7.3.
- [Release notes](https://github.com/apache/airflow/releases)
- [Changelog](https://github.com/apache/airflow/blob/main/RELEASE_NOTES.rst)
- [Commits](apache/airflow@2.5.3...2.7.3)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/tests/requirements-test.txt

@@ -1,4 +1,4 @@
-apache-airflow==2.5.3
+apache-airflow==2.7.3
 apache-airflow-providers-cncf-kubernetes==7.3.0
 apache-airflow-providers-google==10.9.0
 apache-airflow-providers-ssh==3.3.0