Update dependency specifications (#806)

We don't directly depend on psycopg2, so specify SQLAlchemy[postgresql]
instead to let it pick the right driver.

Author: zware

requirements-3.13.txt

@@ -30,7 +30,7 @@ MarkupSafe==3.0.3
 msgpack==1.2.2
 multipart==2.0.1
 packaging==26.3
-psycopg2==2.9.13
+psycopg==3.3.6
 pycparser==3.0
 PyJWT==2.15.0
 pyOpenSSL==26.4.0

requirements.in

@@ -6,4 +6,6 @@ PyYAML
 requests
 treq
 sentry-sdk
-psycopg2
+# buildbot depends on SQLAlchemy, but we add the extra here to ensure the
+# correct leaf dependencies
+SQLAlchemy[postgresql]