build(deps): bump sqlalchemy from 1.3.19 to 1.4.20

[dependabot]

Bumps sqlalchemy from 1.3.19 to 1.4.20.

Release notes

Sourced from sqlalchemy's releases.

1.4.20

Released: June 28, 2021

orm

• [orm] [bug] [regression] Fixed regression in ORM regarding an internal reconstitution step for the _orm.with_polymorphic() construct, when the user-facing object is garbage collected as the query is processed. The reconstitution was not ensuring the sub-entities for the "polymorphic" case were handled, leading to an AttributeError.

  References: #6680

• [orm] [bug] [regression] Adjusted _orm.Query.union() and similar set operations to be correctly compatible with the new capabilities just added in #6661, with SQLAlchemy 1.4.19, such that the SELECT statements rendered as elements of the UNION or other set operation will include directly mapped columns that are mapped as deferred; this both fixes a regression involving unions with multiple levels of nesting that would produce a column mismatch, and also allows the _orm.undefer() option to be used at the top level of such a _orm.Query without having to apply the option to each of the elements within the UNION.

  References: #6678

• [orm] [bug] Adjusted the check in the mapper for a callable object that is used as a @validates validator function or a @reconstructor reconstruction function, to check for "callable" more liberally such as to accommodate objects based on fundamental attributes like __func__ and __call___, rather than testing for MethodType / FunctionType, allowing things like cython functions to work properly. Pull request courtesy Miłosz Stypiński.

  References: #6538

engine

• [engine] [bug] Fixed an issue in the C extension for the _result.Row class which could lead to a memory leak in the unlikely case of a _result.Row object which referred to an ORM object that then was mutated to refer back to the Row itself, creating a cycle. The Python C APIs for tracking GC cycles has been added to the native _result.Row implementation to accommodate for this case.

  References: #5348

• [engine] [bug] Fixed old issue where a _sql.select() made against the token "*",

... (truncated)

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