[workbox-build,workbox-webpack-plugin] source-map-url is deprecated

[rtritto]

source-map-url is deprecated and it's a dependency of workbox-build and workbox-webpack-plugin.

[alexey-koran]

@jeffposnick Hi, maybe you can check this?

[jeffposnick]

We really only need one of the RegExps that the module provided, and it's MIT licensed, so we'll move an adaptation of that code into a local module in the Workbox project.

[jeffposnick]

https://github.com/GoogleChrome/workbox/compare/source-map-url?expand=1 has the change for workbox-build.

Once #2882 is complete, I'll update the branch to do the same for workbox-webpack-plugin.

This should get published as part of our v6.5.0 release.

[jeffposnick]

This is resolved in the https://github.com/GoogleChrome/workbox/releases/tag/v6.5.0 release.