Allow build failures against python 3.7 on Travis-CI.
Allow build failures against python 3.7 on Travis-CI.

We're not actively watching Travis right now, but a recent push broke it -- no
reason to leave it red when it's a trivial fix.

The fix itself is based on: https://github.com/travis-ci/travis-ci/issues/5113

RELNOTES: n/a
PiperOrigin-RevId: 183044364

googlecolab/colabtools,googlecolab/colabtools