chore(deps): update dependency html-minifier-terser to v6

This MR contains the following updates:

Package	Type	Update	Change
html-minifier-terser (source)	devDependencies	major	^5.1.1 -> ^6.0.0

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Release Notes

terser/html-minifier-terser

v6.1.0

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What's Changed

• Add flag to remove newline before tag close by @​lucamattiazzi in https://github.com/terser/html-minifier-terser/pull/85

New Contributors

• @​lucamattiazzi made their first contribution in https://github.com/terser/html-minifier-terser/pull/85

Full Changelog: https://github.com/terser/html-minifier-terser/compare/v6.0.2...v6.1.0

v6.0.2

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Bug Fixes

Fix cli compression (75e3ff7), closes #​74

v6.0.1

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Bug Fixes

• Fix cli compression (4d03536)

v6.0.0

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Breaking Changes

• Terser v5
• minimum supported nodejs version is 12
• minify function is now async

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