4 Change pip's upgrade-strategy to "eager" for python-tools-install.sh.
5 Pip changed its default upgrade-strategy to "only-if-required", which
6 is not correctly upgrading requests (and potentially other packages
7 in the future) to meet other packages' requirements. This results in
8 errors in the build log. By using the upgrade-strategy "eager", pip
9 is able to properly install what is needed.