build: invalidate circleci cache to prune unused nested node modules (#25512)
build: invalidate circleci cache to prune unused nested node modules (#25512)

Yarn 1.x has a bug where it keeps nested unused node modules and doesn't
delete them automatically. This throws off Bazel in some scenarios when
the lock file is updated. This commit invalidates the cache to get a
fresh clean node modules cache without any unused nested directories.
crisbeto/material2,angular/components,crisbeto/material2,angular/components,angular/components,crisbeto/material2,angular/components,crisbeto/material2