Ignore all dunders when checking attributes in `sqlalchemy.util.langhelpers.TypingOnly`
Fixed an internal class that was testing for unexpected attributes to work
correctly under upcoming Python 3.13. Pull request courtesy Edgar
Ramírez-Mondragón.
Fixes: #11334
Closes: #11335
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/11335
Pull-request-sha:
babd703e6e34b93722a54c3adf13aa792d3a03b3
Change-Id: Ia2e7392c9403e25266c7d30b987b577f49d008c0
(cherry picked from commit
eb118e23a29a29469edb4c1927250f4b726de68e)