chore(deps): update dependency rollup to v2.61.0

This MR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	minor	2.60.2 -> 2.61.0

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Release Notes

rollup/rollup

v2.61.0

Compare Source

2021-12-09

Features

• Support ergonomic brand checks for private fields (#​4293)

Bug Fixes

• Improve handling of directory creation on systems with restrictive open files limit (#​4288)

Merge Requests

• #​4288: modifymkdirpath (@​mgrabowski84)
• #​4293: bump deps (@​dnalborczyk)

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