Auto merge of #28152 - servo:jdm-patch-49, r=jdm
Auto merge of #28152 - servo:jdm-patch-49, r=jdm

Update pip when building docker image.

Outdated versions of pip can't find a Rust compiler that's required when installing the python cryptography package.

KiChjang/servo,KiChjang/servo,KiChjang/servo,KiChjang/servo,KiChjang/servo,KiChjang/servo,KiChjang/servo,KiChjang/servo,KiChjang/servo,KiChjang/servo