chore(deps): bump sqlalchemy-continuum from 1.3.12 to 1.3.15

Bumps [sqlalchemy-continuum](https://github.com/kvesteri/sqlalchemy-continuum) from 1.3.12 to 1.3.15.
- [Changelog](https://github.com/kvesteri/sqlalchemy-continuum/blob/master/CHANGES.rst)
- [Commits](https://github.com/kvesteri/sqlalchemy-continuum/commits)

---
updated-dependencies:
- dependency-name: sqlalchemy-continuum
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

poetry.lock

@@ -84,7 +84,7 @@ pillow = "9.5.0"
 gunicorn = "20.1.0"
 boto = "2.49"
 geoip2 = "4.7.0"
-SQLAlchemy-Continuum = "1.3.12"
+SQLAlchemy-Continuum = "1.3.15"
 bleach = "4.1.0"
 stripe = "3.0.0"
 xhtml2pdf = "0.2.6"