Update vue-cli monorepo to v3.12.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@vue/cli-plugin-babel	devDependencies	minor	3.11.0 -> 3.12.0
@vue/cli-plugin-e2e-nightwatch	devDependencies	minor	3.11.0 -> 3.12.0
@vue/cli-plugin-unit-jest	devDependencies	minor	3.11.0 -> 3.12.0
@vue/cli-service (source)	devDependencies	minor	3.11.0 -> 3.12.0

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Release Notes

vuejs/vue-cli

v3.12.0

Compare Source

🚀 New Features

• @vue/cli-service
  • #​4662 Support sass-loader v8 (@​sodatea)

🐛 Bug Fix

• @vue/cli-service
  • #​4666 fix: fix redundant log messages from webpack-dev-server (@​sodatea)
  • #​4613 fix: correctly ignore html templates in copy-webpack-plugin (@​sodatea)
  • #​4550 fix: should not proxy sockjs endpoint (@​sodatea)
  • #​4654 fix: fix ie11 compatibility when css.extract set to true (@​sodatea)
• @vue/cli-shared-utils
  • #​4512 fix(pluginResolution): support dots in scope names (@​ma-jahn)
• @vue/cli
  • #​4525 fix: remove the nonexistent test command from generated README (@​cexbrayat)

📝 Documentation

• @vue/cli
  • #​4551 docs: remove run for yarn commands in readme (@​cexbrayat)
• Other
  • #​4561 Edited Dockerfile of Docker(Nginx) deployment doc (@​vahdet)
  • #​4500 Documentation typo fixes (@​owanhunte)

Committers: 6

• Cédric Exbrayat (@​cexbrayat)
• Haoqun Jiang (@​sodatea)
• Marcel Jahn (@​ma-jahn)
• Natalia Tepluhina (@​NataliaTepluhina)
• Owan Hunte (@​owanhunte)
• vahdet (@​vahdet)

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[coveralls]

Pull Request Test Coverage Report for Build 260

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 84.906%

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Totals
Change from base Build 248:	0.0%
Covered Lines:	45
Relevant Lines:	53

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💛 - Coveralls