Bump pip from 20.1.1 to 20.2 in /docker/build_scripts
Bump pip from 20.1.1 to 20.2 in /docker/build_scripts

Bumps [pip](https://github.com/pypa/pip) from 20.1.1 to 20.2.
- [Release notes](https://github.com/pypa/pip/releases)
- [Changelog](https://github.com/pypa/pip/blob/master/NEWS.rst)
- [Commits](https://github.com/pypa/pip/compare/20.1.1...20.2)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
pypa/manylinux,pypa/manylinux,manylinux/manylinux,manylinux/manylinux,pypa/manylinux