Update dependency rollup-plugin-sourcemaps to ^0.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup-plugin-sourcemaps	^0.4.2 -> ^0.6.0

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Release Notes

maxdavidson/rollup-plugin-sourcemaps (rollup-plugin-sourcemaps)

v0.6.3

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• Fix ES module breaking due to not default-importing CommonJS modules
• Add some warning messages

v0.6.2

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• Fix issue with exports that prevented it from working in Node 13.0-13.6

v0.6.1

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• Fix issue with conditional exports that prevented it from working in Node 13+

v0.6.0

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• Drop support for Node 8
• Update dependencies
• Publish ES module for Node 12+ using conditional exports

v0.5.0

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• Drop support for Node < 8 and make use of ES2017 features
• Switch from Babel to TypeScript
• Remove jsnext:main field from package.json

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