Bump sqlalchemy from 2.0.52 to 2.0.54 in /backend

[dependabot]

Bumps sqlalchemy from 2.0.52 to 2.0.54.

Release notes

Sourced from sqlalchemy's releases.

2.0.54

Released: September 15, 2026

platform

• [platform] [change] Binary wheels are no longer built for Python 3.7. PyPI now rejects wheel files whose filename does not begin with the normalized project name, and the packaging tools that can be installed on Python 3.7 do not produce such a filename. As a result, SQLAlchemy 2.0.44 was the last release to publish Python 3.7 wheels to PyPI, and releases 2.0.45 and later have been available on Python 3.7 only as a source distribution; the wheel builds for Python 3.7 are now removed. Python 3.7 remains supported by the 2.0 series.

• [platform] [bug] Fixed issue where the Cython extensions were compiled without the freethreading_compatible directive, so that they did not declare themselves as safe to run without the GIL. On a free-threaded Python interpreter such as Python 3.13t or 3.14t, importing SQLAlchemy would cause the interpreter to re-enable the GIL, emitting a RuntimeWarning. The directive is now set when building for Python 3.13 and above, and a test has been added which confirms that importing SQLAlchemy on a free-threaded build does not enable the GIL.

  References: #13592

2.0.53

Released: September 14, 2026

orm

• [orm] [bug] Fixed issue where an expression passed to _orm.with_expression() that embedded a _sql.select(), such as a correlated _sql.exists(), would fail to populate the attribute correctly on the second and subsequent executions of an otherwise identical statement, when the _orm.query_expression() attribute was loaded by a relationship loader that emits a second query, i.e. _orm.selectinload(), _orm.lazyload() or _orm.immediateload().

  References: #13560

• [orm] [bug] Fixed memory issue where mapped classes, along with their Table and _orm.Mapper objects, would not be garbage collected after the _orm.registry in which they were mapped had been disposed and dereferenced. The issue would occur for mappings that made use of _orm.relationship() together with constructs such as an

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