fix: add psycopg2-binary to runtime deps (CAR-1422)

alembic upgrade head uses SQLAlchemy sync engine with postgresql:// URL,
which requires psycopg2. The old image had it via cartsnitch-common;
standalone image needs it explicit.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

pyproject.toml

@@ -21,6 +21,7 @@ dependencies = [
     "pydantic-settings>=2.0,<3.0",
     "sqlalchemy[asyncio]>=2.0,<3.0",
     "asyncpg>=0.29,<1.0",
+    "psycopg2-binary>=2.9",
     "resend>=2.0",
     "python-multipart>=0.0.9",
 ]