use pep639 license

use pep639 license

Removed the "license classifier" from setup.cfg for SQLAlchemy 2.0, which
eliminates loud deprecation warnings when building the package.  SQLAlchemy
2.1 will use a full :pep:`639` configuration in pyproject.toml while
SQLAlchemy 2.0 remains using ``setup.cfg`` for setup.

for main, also bumping setuptools to 77.0.3 as we no longer have
py3.7, 3.8 to worry about

Change-Id: If732dca7f9b57a4c6a789a68ecc77f0293be4786