Source-map needs to be updated to 0.8.0-beta.0

[RDIL]

See terser/terser#1164 for reasoning. This breaks Node.js v18.

[cspotcode]

In the interim, @cspotcode/source-map-support may work as a drop-in replacement. I'm not 100% sure, but I checked the code and I don't think it has the fetch check. Might not work if you need browser support.