Bump circleci/python from 3.9.0-buster to 3.9.3-buster
Bump circleci/python from 3.9.0-buster to 3.9.3-buster

Bumps circleci/python from 3.9.0-buster to 3.9.3-buster.

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
trussworks/circleci-docker-primary