Bump sqlalchemy from 2.0.20 to 2.0.21

[dependabot]

Bumps sqlalchemy from 2.0.20 to 2.0.21.

Release notes

Sourced from sqlalchemy's releases.

2.0.21

Released: September 18, 2023

orm

• [orm] [bug] Adjusted the ORM's interpretation of the "target" entity used within Update and Delete to not interfere with the target "from" object passed to the statement, such as when passing an ORM-mapped _orm.aliased construct that should be maintained within a phrase like "UPDATE FROM". Cases like ORM session synchonize using "SELECT" statements such as with MySQL/ MariaDB will still have issues with UPDATE/DELETE of this form so it's best to disable synchonize_session when using DML statements of this type.

  References: #10279

• [orm] [bug] Added new capability to the _orm.selectin_polymorphic() loader option which allows other loader options to be bundled as siblings, referring to one of its subclasses, within the sub-options of parent loader option. Previously, this pattern was only supported if the _orm.selectin_polymorphic() were at the top level of the options for the query. See new documentation section for example.

  As part of this change, improved the behavior of the _orm.Load.selectin_polymorphic() method / loader strategy so that the subclass load does not load most already-loaded columns from the parent table, when the option is used against a class that is already being relationship-loaded. Previously, the logic to load only the subclass columns worked only for a top level class load.

  References: #10348

engine

• [engine] [bug] Fixed a series of reflection issues affecting the PostgreSQL, MySQL/MariaDB, and SQLite dialects when reflecting foreign key constraints where the target column contained parenthesis in one or both of the table name or column name.

  References: #10275

sql

• [sql] [usecase] Adjusted the _types.Enum datatype to accept an argument of None for the _types.Enum.length parameter, resulting in a VARCHAR or other textual type with no length in the resulting DDL. This

... (truncated)

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