Update dependency source-map-support to v0.5.21

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
source-map-support	0.5.20 -> 0.5.21

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Release Notes

evanw/node-source-map-support

### [`v0.5.21`](https://togithub.com/evanw/node-source-map-support/compare/v0.5.20...v0.5.21) [Compare Source](https://togithub.com/evanw/node-source-map-support/compare/v0.5.20...v0.5.21)

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