Narrow range for dev dependencies (#6008)
Narrow range for dev dependencies (#6008)

This is a follow up to #5912. We've been running with one of the dev
dependencies more narrowly defined and it hasn't shown any problems, so
this does the same with the other dev dependencies.
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data