test/py/requirements.txt: Bump setuptools to 70.3.0

There is some potential security issue resolved by upgrading to v70.0.0
here and the latest is now v70.3.0.

Reported-by: GitHub dependabot
Suggested-by: Sebastian Kropatsch <seb-dev@mail.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
1 file changed