Bump alembic from 1.4.2 to 1.4.3

Bumps [alembic](https://github.com/sqlalchemy/alembic) from 1.4.2 to 1.4.3.
- [Release notes](https://github.com/sqlalchemy/alembic/releases)
- [Changelog](https://github.com/sqlalchemy/alembic/blob/master/CHANGES)
- [Commits](https://github.com/sqlalchemy/alembic/commits)

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

Author: dependabot-preview[bot]

poetry.lock

@@ -8,7 +8,7 @@ license = "MIT"
 [tool.poetry.dependencies]
 python = "^3.7"
 algoliasearch = ">=2.0,<3.0"
-alembic = "1.4.2"
+alembic = "1.4.3"
 bandit = "1.5.1"
 click = "7.1.2"
 flake8 = "3.8.3"