Upgrade pip before installing python requirements #24
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This drastically improves the time to install python requirements on
debian:10.
22m59s before: https://github.com/shadow/tgen/runs/4485955730?check_suite_focus=true
2m36s after: https://github.com/shadow/tgen/runs/4486322368?check_suite_focus=true
I think the newer version of pip pulls pre-built binaries from a global cache instead of rebuilding locally.