Master Travis build fails due to pipenv hangs on aarch64, armhf, and ppc64le

[nicowilliams]

E.g., https://travis-ci.org/stedolan/jq/jobs/511009793

Installing setuptools, pip, wheel...
done.
Virtualenv location: /home/travis/.local/share/virtualenvs/docs-Njohi5QL
Installing dependencies from Pipfile.lock (62a1ce)…
     =========================------- 4/5 — 00:00:02
No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

[itchyny]

We have switched to GitHub Actions in #2596, so closing.