update typing for mypy 1.11; pin plugin to <1.11

update typing for mypy 1.11; pin plugin to <1.11

Fixed internal typing issues to establish compatibility with mypy 1.11.0.
Note that this does not include issues which have arisen with the
deprecated mypy plugin used by SQLAlchemy 1.4-style code; see the addiional
change note for this plugin indicating revised compatibility.

The legacy mypy plugin is no longer fully functional with the latest series
of mypy 1.11.0, as changes in the mypy interpreter are no longer compatible
with the approach used by the plugin.  If code is dependent on the legacy
mypy plugin with sqlalchemy2-stubs, it's recommended to pin mypy to be
below the 1.11.0 series.    Seek upgrading to the 2.0 series of SQLAlchemy
and migrating to the modern type annotations.

Change-Id: Ib8fef93ede588430dc0f7ed44ef887649a415821