Update dependency svelte-loader to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
svelte-loader	2.13.6 -> 3.1.1

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Release Notes

sveltejs/svelte-loader

v3.1.1

Compare Source

• Fix empty sourcesContent (#​177)

v3.1.0

Compare Source

• Pass preprocessor source maps to compiler (#​172)
• Recompile style imports after an error (#​173)

v3.0.0

Compare Source

• Breaking: compiler options must now be specified under compilerOptions (#​159)
• Breaking: removed support for deprecated style, script, and markup options, which are now located under the preprocess configuration (#​158)
• Breaking: dropped Svelte 2 support (#​150)
• Breaking: dropped Node 8 support (#​157)
• Add Webpack 5 support (#​151)
  • Webpack 5 requires an additional rule in webpack.config.js to load the Svelte runtime correctly
• Replace broken Svelte 2 HMR with the implementation from rixo/svelte-loader-hot (#​156)
• Add Node 14 support and remove virtual modules implementation (fixes #​125, #​131)

Thanks to @​non25, @​Smittyvb, @​rixo, and the numerous others who contributed to this major release!

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