Update dependency rollup-plugin-svelte to v7 - abandoned

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup-plugin-svelte	^5.2.1 -> ^7.0.0

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Release Notes

sveltejs/rollup-plugin-svelte

v7.1.0

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• Preprocessor sourcemap support (#​157)

v7.0.0

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• New minimum version requirements (#​138, #​142):
  • Rollup 2+
  • Svelte 3.5+ (Svelte 2 is no longer supported)
  • Node 10+
• Breaking: Offload CSS handling to Rollup — you will now need an external plugin like rollup-plugin-css-only to extract your styles to .css files as demonstrated in the template (#​147)
• Breaking: Options to be passed directly to the Svelte compiler must now go under a compilerOptions key in the plugin configuration object (#​145)
• Extend CompileOptions interface directly (#​126)
• Pass relative filename to svelte compiler (#​131)
• Link sourcemap with source correctly (#​140)
• Respect sourcemapExcludeSources Rollup config (#​93)
• Keep all sourcemaps from chunk (#​44)

v6.1.1

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• Use require('svelte/compiler') rather than require('svelte/compiler.js') to work with new Svelte exports map

v6.1.0

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• feat: allow custom Svelte compilers via new svelte option: (#​124)
• fix: use native fs.existsSync method: (50e03e5)
• chore: Power CI via GitHub Action (61ead9a..23e83a4)

v6.0.2

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• Added default value to CssWriter.write map option (#​135)
• Do not warn about missing unused css selectors if both css and emitCss are false (#​127)

v6.0.1

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• Fix types to allow css: false (#​125)

v6.0.0

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• Breaking changes:
  • Rollup 1.19.2+ is now required
  • The path passed to css.write() is now relative to the destination directory.
• Other changes:
  • Add types for generate, customElement, and preprocess options (#​111, #​114, and #​118)
  • Use Rollup's emitFile API (#​72)
  • Warn when package.json does not expose itself via exports (#​119)

v5.2.3

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• Actually publish typings (#​110)

v5.2.2

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• Handle files with .svelte in the middle of their filename (#​107)

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