Bump sqlalchemy from 1.4.25 to 1.4.26

[dependabot]

Bumps sqlalchemy from 1.4.25 to 1.4.26.

Release notes

Sourced from sqlalchemy's releases.

1.4.26

Released: October 19, 2021

orm

• [orm] [bug] Improved the exception message generated when configuring a mapping with joined table inheritance where the two tables either have no foreign key relationships set up, or where they have multiple foreign key relationships set up. The message is now ORM specific and includes context that the _orm.Mapper.inherit_condition parameter may be needed particularly for the ambiguous foreign keys case.

• [orm] [bug] Fixed issue with _orm.with_loader_criteria() feature where ON criteria would not be added to a JOIN for a query of the form select(A).join(B), stating a target while making use of an implicit ON clause.

  References: #7189

• [orm] [bug] Fixed bug where the ORM "plugin", necessary for features such as _orm.with_loader_criteria() to work correctly, would not be applied to a _sql.select() which queried from an ORM column expression if it made use of the _sql.ColumnElement.label() modifier.

  References: #7205

• [orm] [bug] Add missing methods added in #6991 to _scoping.scoped_session and _asyncio.async_scoped_session().

  References: #7103

• [orm] [bug] An extra layer of warning messages has been added to the functionality of _orm.Query.join() and the ORM version of _sql.Select.join(), where a few places where "automatic aliasing" continues to occur will now be called out as a pattern to avoid, mostly specific to the area of joined table inheritance where classes that share common base tables are being joined together without using explicit aliases. One case emits a legacy warning for a pattern that's not recommended, the other case is fully deprecated.

  The automatic aliasing within ORM join() which occurs for overlapping mapped tables does not work consistently with all APIs such as _orm.contains_eager(), and rather than continue to try to make these use cases work everywhere, replacing with a more user-explicit pattern is clearer, less prone to bugs and simplifies SQLAlchemy's internals further.

  The warnings include links to the errors.rst page where each pattern is

... (truncated)

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