Bump sqlalchemy from 2.0.19 to 2.0.20 in /{{cookiecutter.project_slug}}/backend

[dependabot]

Bumps sqlalchemy from 2.0.19 to 2.0.20.

Release notes

Sourced from sqlalchemy's releases.

2.0.20

Released: August 15, 2023

orm

• [orm] [usecase] Implemented the "RETURNING '*'" use case for ORM enabled DML statements. This will render in as many cases as possible and return the unfiltered result set, however is not supported for multi-parameter "ORM bulk INSERT" statements that have specific column rendering requirements.

  References: #10192

• [orm] [bug] Fixed fundamental issue which prevented some forms of ORM "annotations" from taking place for subqueries which made use of _sql.Select.join() against a relationship target. These annotations are used whenever a subquery is used in special situations such as within _orm.PropComparator.and_() and other ORM-specific scenarios.

  This change is also backported to: 1.4.50

  References: #10223

• [orm] [bug] Fixed fundamental issue which prevented some forms of ORM "annotations" from taking place for subqueries which made use of _sql.Select.join() against a relationship target. These annotations are used whenever a subquery is used in special situations such as within _orm.PropComparator.and_() and other ORM-specific scenarios.

  This change is also backported to: 1.4.50

  References: #10223

• [orm] [bug] Fixed issue where the ORM's generation of a SELECT from a joined inheritance model with same-named columns in superclass and subclass would somehow not send the correct list of column names to the CTE construct, when the RECURSIVE column list were generated.

  References: #10169

• [orm] [bug] Fixed fairly major issue where execution options passed to _orm.Session.execute(), as well as execution options local to the ORM executed statement itself, would not be propagated along to eager loaders such as that of _orm.selectinload(), _orm.immediateload(), and _orm.subqueryload(), making it impossible to do things such as disabling the cache for a single statement or using schema_translate_map for a single statement, as well as the use of user-custom execution options. A change has been made where all user-facing execution options present for _orm.Session.execute() will

... (truncated)

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[gaganpreet]

@dependabot squash and merge