Set upper bound to pg8000 version

pg8000 1.16.6 introduced a change that broke compatibility with
sqlalchemy < 1.14.0 (check the related issue for more details).

Fixes: #5645

diff --git a/setup.py b/setup.py
index 891dcbf77c807cda123a0082375d93fb5b16654e..1fdc91f1200a7ad19cb98e0f77e52d454cb2dc9c 100644 (file)
--- a/setup.py
+++ b/setup.py
@@ -192,7 +192,7 @@ def run_setup(with_cext):
             ],
             "postgresql": ["psycopg2"],
             "postgresql_psycopg2binary": ["psycopg2-binary"],
-            "postgresql_pg8000": ["pg8000"],
+            "postgresql_pg8000": ["pg8000<1.16.6"],
             "postgresql_psycopg2cffi": ["psycopg2cffi"],
             "oracle": ["cx_oracle"],
             "mssql_pyodbc": ["pyodbc"],