Update rc and deep-extend
Update rc and deep-extend

There is a security issue with 'deep-extend' package which is a dependency
of 'rc'. Further details on https://nodesecurity.io/advisories/612

Fixes #7255

SimenB/webpack,webpack/webpack,SimenB/webpack,SimenB/webpack,EliteScientist/webpack,SimenB/webpack,EliteScientist/webpack,NekR/webpack,webpack/webpack,webpack/webpack,webpack/webpack,NekR/webpack