fix(@angular-devkit/build-angular): update copy-webpack-plugin dependency

[alan-agius4]

This fixes the issue that newly added files are not copied on serve

Fixes #9669

[alan-agius4]

PR at upstream webpack-contrib/copy-webpack-plugin#296

[ngbot]

	Artifact	Baseline	Current	Change
❕	cli/new-production/test-project/main.js	168.60KB	168.62KB	+21 bytes

[ngbot]

	Artifact	Baseline	Current	Change
❕	cli/new-production/test-project/main.js	168.60KB	168.62KB	+21 bytes

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