Bump rollup-plugin-uglify from 6.0.3 to 6.0.4

[dependabot-preview[bot]]

Bumps rollup-plugin-uglify from 6.0.3 to 6.0.4.

Commits

• 60df3a9 v6.0.4
• d15fe13 Upgrade rollup and fix test
• 1c9c1c5 Upgrade serialize-javascript
• See full diff in compare view

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