deps: update dependency sqlalchemy to v2.0.40 (GoogleCloudPlatform#3115)

* deps: update dependency sqlalchemy to v2.0.40

* chore: keep SQLAlchemy 1.x

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Co-authored-by: Knut Olav Løite <[email protected]>

Author: renovate-bot

samples/python/sqlalchemy2-sample/requirements.txt

@@ -1,6 +1,6 @@
 psycopg[binary]==3.2.6
 pytz==2025.2
-sqlalchemy==2.0.39
+sqlalchemy==2.0.40
 google~=3.0.0
 google.auth~=2.38.0
 testcontainers~=4.9.0