chore(deps): bump alembic from 1.15.2 to 1.16.1

[dependabot]

Bumps alembic from 1.15.2 to 1.16.1.

Release notes

Sourced from alembic's releases.

1.16.1

Released: May 21, 2025

bug

• [bug] [command] Fixed regression caused by the pathlib refactoring that removed the use of Config.get_template_directory() as the canonical source of templates; the method is still present however it no longer would be consulted for a custom config subclass, as was the case with flask-migrate.

  References: #1660

• [bug] [command] Fixed regression caused by the pathlib refactoring where the "missing template" error message failed to render the name of the template that could not be found.

  References: #1659

1.16.0

Released: May 21, 2025

feature

• [feature] [environment] Added optional PEP 621 support to Alembic, allowing all source code related configuration (e.g. local file paths, post write hook configurations, etc) to be configured in the project's pyproject.toml file. A new init template pyproject is added which illustrates a basic PEP 621 setup.

  Besides being better integrated with a Python project's existing source code configuration, the TOML format allows for more flexible structures, allowing configuration items like version_locations and prepend_sys_path to be configured as lists of path strings without the need for path separator characters used by ConfigParser format. The feature continues to support the %(here)s token which can substitute the absolute parent directory of the pyproject.toml file when consumed.

  The PEP 621 feature supports configuration values that are relevant to source code organization and generation only; it does not accommodate configuration of database connectivity or logging, which remain under the category of "deployment" configuration and continue to be part of alembic.ini, or whatever configurational method is established by the env.py file. Using the combination of pyproject.toml for source code configuration along with a custom database/logging configuration method established in env.py will allow the alembic.ini file to be

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