Update dependency rollup to v2.55.1

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup (source)	2.54.0 -> 2.55.1

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Release Notes

rollup/rollup

v2.55.1

Compare Source

2021-07-29

Bug Fixes

• Improve CLI warning message for unused external imports (#​4194)

Merge Requests

• #​4194: Align batch warning for UNUSED_EXTERNAL_IMPORT to individual warning (@​benmccann)

v2.55.0

Compare Source

2021-07-28

Features

• Support default export live-bindings when generating ESM output (#​4182)

Bug Fixes

• Always write ["default"] as computed property when used as named export (#​4182)
• Do not mask default export TDZ errors (#​4182)

Merge Requests

• #​4182: Use mutable bindings for default exports (@​lukastaegert)

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