Update dependency html-webpack-plugin to v4.0.0-beta.8

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This PR contains the following updates:

Package	Type	Update	Change
html-webpack-plugin	devDependencies	patch	4.0.0-beta.5 -> 4.0.0-beta.8

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Release Notes

jantimon/html-webpack-plugin

v4.0.0-beta.8

Compare Source

v4.0.0-beta.7

Compare Source

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