fix: install typing_extensions on Python < 3.10

For some reasons tests pass, but it's necessary.

Close #252.

diff --git a/psycopg/setup.cfg b/psycopg/setup.cfg
index fac80d853ca20efa89330416e573898143a9fd6c..af59b76fd5db42c4d9cb9f60f7ee01dc4c0baf94 100644 (file)
--- a/psycopg/setup.cfg
+++ b/psycopg/setup.cfg
@@ -39,7 +39,7 @@ packages = find:
 zip_safe = False
 install_requires =
     backports.zoneinfo >= 0.2.0; python_version < "3.9"
-    typing_extensions >= 3.10; python_version < "3.8"
+    typing_extensions >= 3.10; python_version < "3.10"
     tzdata; sys_platform == "win32"
 
 [options.package_data]