Update dependency @vue/eslint-config-standard to v5

This MR contains the following updates:

Package	Type	Update	Change	References
@​vue/eslint-config-standard	devDependencies	major	4.0.0 -> 5.0.0	source

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Release Notes

vuejs/eslint-config-standard

v5.0.0

• The underlying base config was updated from v12 to v14. Full changelog at https://github.com/standard/standard/blob/v14.3.1/CHANGELOG.md
• Requires ESLint 6
• eslint-plugin-import, eslint-plugin-node, eslint-plugin-promise, eslint-plugin-standard are now peerDependencies, to better conform to the plugin loading mechanism of eslint

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