Update dependency source-map to v0.7.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
source-map	0.7.3 -> 0.7.4

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Release Notes

mozilla/source-map (source-map)

### [`v0.7.4`](https://togithub.com/mozilla/source-map/compare/0.7.3...v0.7.4) [Compare Source](https://togithub.com/mozilla/source-map/compare/0.7.3...v0.7.4)

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