Update dependency eslint-plugin-vue to v6

This MR contains the following updates:

Package	Type	Update	Change	References
eslint-plugin-vue	devDependencies	major	5.2.3 -> 6.0.1	homepage, source

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Release Notes

vuejs/eslint-plugin-vue

v6.0.1

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🐛 Bug Fixes

• #​984 Fixed an issue where the message "requires a peer of eslint@^5.0.0" was reported when installing the eslint-plugin-vue.

v6.0.0

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💥 Breaking Changes

• #​979 Dropped support for Node.js 6.x, ESLint 5.x.
• #​940 Dropped autofix of vue/prop-name-casing.
• #​823 Added Nuxt properties to the default order of vue/order-in-components.
• #​895 #​807 Upgrade to vue-eslint-parser@6.0.4

✨ Enhancements

Core:

• #​807 Support new syntax in Vue.js 2.6.
• #​979 Added support for ESLint 6.x.

New Rules:

• #​798 Added vue/no-empty-pattern rule applies no-empty-pattern rule to expressions in <template>.
• #​794 Added vue/dot-location rule applies dot-location rule to expressions in <template>.
• #​795 Added vue/keyword-spacing rule applies keyword-spacing rule to expressions in <template>.
• #​838 Added vue/no-deprecated-scope-attribute rule that reports deprecated scope attribute in Vue.js v2.5.0+.
• #​837 Added vue/valid-v-slot rule that checks whether every v-slot directive is valid.
• #​836 Added vue/v-slot-style rule that enforces v-slot directive style which you should use shorthand or long form.

🐛 Bug Fixes

• #​904 Fixed vue/use-v-on-exact to allows events with different key codes
• #​937 Fixed typo in vue/valid-v-else rule message

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All commits: v5.2.3 -> v6.0.0

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