add overload stubs for proxied classes

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### Description
Closes #1146
Closes #1147

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Overloaded functions would not have type stubs generated by the stub generator for proxied classes. Now they will.

### Checklist
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This pull request is:

- [ ] A documentation / typographical error fix
	- Good to go, no issue or tests are needed
- [x] A short code fix
	- please include the issue number, and create an issue if none exists, which
	  must include a complete example of the issue.  one line code fixes without an
	  issue and demonstration will not be accepted.
	- Please include: `Fixes: #<issue number>` in the commit message
	- please include tests.   one line code fixes without tests will not be accepted.
- [ ] A new feature implementation
	- please include the issue number, and create an issue if none exists, which must
	  include a complete example of how the feature would look.
	- Please include: `Fixes: #<issue number>` in the commit message
	- please include tests.

Closes: #1148
Pull-request: https://github.com/sqlalchemy/alembic/pull/1148
Pull-request-sha: ed3c28cc78e57314b7a4e533d77108efc6751949

Change-Id: I7c0ee9d333015174ee6ab754909748f745af2ff9

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/requirements.py b/tests/requirements.py
index aa88f66..c774e67 100644
--- a/tests/requirements.py
+++ b/tests/requirements.py
@@ -402,7 +402,7 @@ class DefaultRequirements(SuiteRequirements):
             requirements, "black and zimports are required for this test"
         )
         version = exclusions.only_if(
-            lambda _: compat.py39, "python 3.9 is required"
+            lambda _: compat.py311, "python 3.11 is required"
         )
 
         sqlalchemy = exclusions.only_if(