chore(deps): update dependency rollup to v2.60.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup (source)	2.60.0 -> 2.60.1

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Release Notes

rollup/rollup

### [`v2.60.1`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​2601) [Compare Source](https://togithub.com/rollup/rollup/compare/v2.60.0...v2.60.1) *2021-11-22* ##### Bug Fixes - Make sure virtual files have proper file extensions when preserving modules ([#​4270](https://togithub.com/rollup/rollup/issues/4270)) ##### Pull Requests - [#​4270](https://togithub.com/rollup/rollup/pull/4270): Use entryFileNames when generating filenames for virtual modules ([@​BPScott](https://togithub.com/BPScott))

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