Update terser-webpack-plugin version

[portexe]

Older versions of terser-webpack-plugin are using a highly vulnerable version of serialize-javascript. In order to fix this, we need to update the terser-webpack-plugin which has now addressed this vulnerability.

More info on the vulnerability located here

Screenshot:

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[portexe]

I just agreed to the CLA so that will check will need to be re-started.

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

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Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[ajdaniel]

It will be nice to have this and release it

[gtlambert]

Hoping to have this one merged!

[gaearon]

As explained in #9469 (comment), there is no actual vulnerability here.

[gaearon]

We can't do a major version bump here. You need to work with terser-webpack-plugin to get them to release 3.x patch with this change. Then we can bump to that.

[portexe]

@gaearon it appears version 3.1.0 of terser-webpack-plugin contains the update that we want. I just updated the PR.

[gaearon]

Hmm. Actually this doesn't make sense either.

3.0.7 which we use on master already has the fix.

https://unpkg.com/browse/terser-webpack-plugin@3.0.7/package.json
https://www.npmjs.com/advisories/1548

So what we need to do is update the version used by react-scripts@3 today.

[gaearon]

(I'll do this)