Update dependency rollup to v2.40.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup (source)	2.39.1 -> 2.40.0

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Release Notes

rollup/rollup

### [`v2.40.0`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​2400) [Compare Source](https://togithub.com/rollup/rollup/compare/v2.39.1...v2.40.0) _2021-02-26_ ##### Features - Make sure that entry point variable names take precedence over variable names in dependencies when deconflicting ([#​3977](https://togithub.com/rollup/rollup/issues/3977)) ##### Bug Fixes - Replace `:` in generated file names to prevent invalid files on Windows ([#​3972](https://togithub.com/rollup/rollup/issues/3972)) ##### Pull Requests - [#​3972](https://togithub.com/rollup/rollup/pull/3972): Don't allow `:` in file names ([@​lukastaegert](https://togithub.com/lukastaegert)) - [#​3976](https://togithub.com/rollup/rollup/pull/3976): Add soft breaks to guide to improve mobile experience ([@​lukastaegert](https://togithub.com/lukastaegert)) - [#​3977](https://togithub.com/rollup/rollup/pull/3977): Reverse module deconflicting order ([@​lukastaegert](https://togithub.com/lukastaegert))

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