Update dependency @rollup/plugin-commonjs to v20

This MR contains the following updates:

Package	Type	Update	Change
@rollup/plugin-commonjs	devDependencies	major	^19.0.0 -> ^20.0.0

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Release Notes

rollup/plugins

v20.0.0

2021-07-30

Breaking Changes

• fix: Correctly infer module name for any separator (#​924)

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