chore(deps): update dependency rollup to v2.50.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup (source)	2.50.5 -> 2.50.6

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Release Notes

rollup/rollup

v2.50.6

Compare Source

2021-06-03

Bug Fixes

• Do not consider the object spread operator as side effect when propertyReadSideEffects are false (#​4119)
• Detect side effects when returning thenables from async arrow functions (#​4120)

Pull Requests

• #​4119: Respect propertyReadSideEffects in spread elements (@​lukastaegert)
• #​4120: Detect async arrow thenable side effects (@​lukastaegert)

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