fix(deps): update dependency vue-echarts to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
vue-echarts	^7.0.3 → ^8.0.0

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Release Notes

ecomfe/vue-echarts (vue-echarts)

v8.0.1

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Fixes

• Clarified that manual-update and reactive option updates are mutually exclusive—manual charts now ignore prop changes after the first render.
• Optimized the slot handling logic.

v8.0.0

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Breaking changes

• Updated peer dependency for echarts to ^6.0.0.
• Updated peer dependency for vue to ^3.3.0.
• Dropped support for browsers without native class support.
• Removed vue-echarts/csp entry. Use vue-echarts instead. Only manually include vue-echarts/style.css if you are both enforcing a strict CSP that prevents inline <style> injection and targeting browsers that don't support the CSSStyleSheet() constructor.

New features

• ECharts 6 support.
• Added slots for tooltip and data view.
• Added support for getter in provide/inject.
• Added smart update strategy to make updates more effortless.
• Made CSS border-radius work out-of-the-box.

Chore

• Built with tsdown.
• Switched demo from webpack to rolldown-vite.
• Switched to ESLint flat config.
• Added unit test with Vitest.

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