Update dependency rollup to v2.53.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup (source)	2.53.0 -> 2.53.1

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Release Notes

rollup/rollup

### [`v2.53.1`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​2531) [Compare Source](https://togithub.com/rollup/rollup/compare/v2.53.0...v2.53.1) *2021-07-11* ##### Bug Fixes - Do not omit namespace reexports when `treeshake` is `false` ([#​4175](https://togithub.com/rollup/rollup/issues/4175)) ##### Pull Requests - [#​4175](https://togithub.com/rollup/rollup/pull/4175): Generate namespace objects when not tree-shaking ([@​lukastaegert](https://togithub.com/lukastaegert))

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