MDL-66109 js: Fix circular dependency in Shifter dependency
Shifter is using an ancient and no-longer supported of Istanbul. That
version contains a circular dependency whereby it fetches the version
from the index that included the file in the first place. This throws a
warning on newer versions of Node.
The fix here is simple and intended to be the bare minimum to remove
these warnings anad resolve the issue.
We have forked the istanbul project and created a v0.1.37_moodle branch
at the root version of the Istanbul version that Shifter uses (v0.1.37
tag). The circular dependency is then addressed and a new tag created.
I have then forked Shifter, pointing its package.json at the tar.gz
download of that new tag and pushed a new branch and tag for that fix.
Following this our own package.json is updated to point to the tar.gz
version of the new Shifter tag.
