Bump sqlalchemy from 1.4.0 to 1.4.3 (#523)

Bumps [sqlalchemy](https://github.com/sqlalchemy/sqlalchemy) from 1.4.0 to 1.4.3.
- [Release notes](https://github.com/sqlalchemy/sqlalchemy/releases)
- [Changelog](https://github.com/sqlalchemy/sqlalchemy/blob/master/CHANGES)
- [Commits](https://github.com/sqlalchemy/sqlalchemy/commits)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -1,4 +1,4 @@
-sqlalchemy==1.4.0
+sqlalchemy==1.4.3
 flask==1.1.2
 passlib==1.7.4
 pymysql==1.0.2