All CI is failing, some Jabba problem?

[SethTisue]

see e.g. #190 where https://app.travis-ci.com/github/playframework/cachecontrol/builds/239784037 has

'' is not a valid version.
The command "if [ ! -f ~/.jabba/jabba.sh ]; then curl -L -v --retry 5 -o jabba-install.sh https://git.io/jabba && bash jabba-install.sh; fi" failed and exited with 1 during .
Your build has been stopped.

I guess the ideal solution would be to switch to GitHub Actions and use actions/setup-java to get our Java, but just fixing the Travis-CI build would also be welcome.

[SethTisue]

seems fixed, as seen at e.g. #187