Update sqlalchemy requirement from ~=2.0.48 to ~=2.0.49

[dependabot]

Updates the requirements on sqlalchemy to permit the latest version.

Release notes

Sourced from sqlalchemy's releases.

2.0.49

Released: April 3, 2026

orm

• [orm] [bug] Fixed issue where _orm.Session.get() would bypass the identity map and emit unnecessary SQL when with_for_update=False was passed, rather than treating it equivalently to the default of None. Pull request courtesy of Joshua Swanson.

  References: #13176

• [orm] [bug] Fixed issue where chained _orm.joinedload() options would not be applied correctly when the final relationship in the chain is declared on a base mapper and accessed through a subclass mapper in a _orm.with_polymorphic() query. The path registry now correctly computes the natural path when a property declared on a base class is accessed through a path containing a subclass mapper, ensuring the loader option can be located during query compilation.

  References: #13193

• [orm] [bug] [inheritance] Fixed issue where using _orm.Load.options() to apply a chained loader option such as _orm.joinedload() or _orm.selectinload() with _orm.PropComparator.of_type() for a polymorphic relationship would not generate the necessary clauses for the polymorphic subclasses. The polymorphic loading strategy is now correctly propagated when using a call such as joinedload(A.b).options(joinedload(B.c.of_type(poly))) to match the behavior of direct chaining e.g. joinedload(A.b).joinedload(B.c.of_type(poly)).

  References: #13202

• [orm] [bug] [inheritance] Fixed issue where using chained loader options such as _orm.selectinload() after _orm.joinedload() with _orm.PropComparator.of_type() for a polymorphic relationship would not properly apply the chained loader option. The loader option is now correctly applied when using a call such as joinedload(A.b.of_type(poly)).selectinload(poly.SubClass.c) to eagerly load related objects.

  References: #13209

typing

• [typing] [bug] Fixed a typing issue where the typed members of :data:.func would return the appropriate class of the same name, however this creates an issue for

... (truncated)

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