Upgrade graceful-fs to support throwIfNoEntry in input/output filesystem

[markjm]

First step in being able to complete:
webpack/enhanced-resolve#316
xz64/license-webpack-plugin#109

What kind of change does this PR introduce?
deps upgrade to support isaacs/node-graceful-fs#221

Did you add tests for your changes?
no

Does this PR introduce a breaking change?
no

What needs to be documented once your changes are merged?
nothing

[webpack-bot]

For maintainers only:

• This needs to be documented (issue in webpack/webpack.js.org will be filed when merged)
• This needs to be backported to webpack 4 (issue will be created when merged)

[markjm]

Seems dependabot is still on vacation, so making this change my self!

[sokra]

Thanks