chore(deps): update dependency rollup to v2.26.11

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	patch	2.26.10 -> 2.26.11

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Release Notes

rollup/rollup

### [`v2.26.11`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​22611) [Compare Source](https://togithub.com/rollup/rollup/compare/v2.26.10...v2.26.11) _2020-09-08_ ##### Bug Fixes - Do not fail for unknown nodes as if statement branches ([#​3769](https://togithub.com/rollup/rollup/issues/3769)) ##### Pull Requests - [#​3769](https://togithub.com/rollup/rollup/pull/3769): Handle debugger statements as if-statement branches ([@​lukastaegert](https://togithub.com/lukastaegert))

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