Bump apache-airflow-providers-ftp in /plugins/flytekit-airflow (#2378)

Bumps [apache-airflow-providers-ftp](https://github.com/apache/airflow) from 3.6.0 to 3.7.0.
- [Release notes](https://github.com/apache/airflow/releases)
- [Changelog](https://github.com/apache/airflow/blob/main/RELEASE_NOTES.rst)
- [Commits](apache/airflow@providers-ftp/3.6.0...providers-ftp/3.7.0)

---
updated-dependencies:
- dependency-name: apache-airflow-providers-ftp
  dependency-type: indirect
...

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plugins/flytekit-airflow/dev-requirements.txt

@@ -38,7 +38,7 @@ apache-airflow-providers-common-sql==1.8.0
     #   apache-airflow
     #   apache-airflow-providers-google
     #   apache-airflow-providers-sqlite
-apache-airflow-providers-ftp==3.6.0
+apache-airflow-providers-ftp==3.7.0
     # via apache-airflow
 apache-airflow-providers-google==10.11.0
     # via