build: update rollup to version 2.23.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	dependencies	patch	2.23.0 -> 2.23.1
rollup (source)	devDependencies	patch	2.23.0 -> 2.23.1

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Release Notes

rollup/rollup

v2.23.1

Compare Source

2020-08-07

Bug Fixes

• Fix an issue where dynamically importing an entry point could return a malformed namespace for CJS and AMD formats (#​3709)

Pull Requests

• #​3709: Properly construct namespace when dynamically importing chunks with facades in default export mode (@​lukastaegert)

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