[CI][Python][C++] Avoid compiling grpcio from source

[pitrou]

Describe the enhancement requested

This wastes CI time:
https://app.travis-ci.com/github/apache/arrow/jobs/593143816#L1806

Component(s)

Continuous Integration

[pitrou]

@assignUser @raulcd

[kou]

https://pypi.org/project/grpcio/1.49.1/#files has grpcio-1.49.1-cp38-cp38-manylinux_2_17_aarch64.whl.
I don't know why it's not used...

[pitrou]

pip probably needs to be upgraded to recognize manylinux_2_17.

[assignUser]

It uses python3-pip from ubuntu 20.04 so probably? I will test it

[pitrou]

@assignUser Were you able to advance on this?

[pitrou]

This was fixed piecemeal by several PRs including #43852