chore(deps): update github artifact actions (major)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/download-artifact	action	major	v7 → v8
actions/upload-artifact	action	major	v6 → v7

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Release Notes

actions/download-artifact (actions/download-artifact)

v8

Compare Source

actions/upload-artifact (actions/upload-artifact)

v7

Compare Source

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Configuration

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[pkg-pr-new]

• nuxt-cli-playground

  npm i https://pkg.pr.new/create-nuxt@1236
  

  npm i https://pkg.pr.new/nuxi@1236
  

  npm i https://pkg.pr.new/@nuxt/cli@1236
  

commit: 9880de1

[codspeed-hq]

Merging this PR will not alter performance

✅ 2 untouched benchmarks

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_{Comparing renovate/major-github-artifact-actions (9880de1) with main (d2fddf7)}

[github-actions]

📦 Bundle Size Comparison

📉 nuxi

Metric	Base	Head	Diff
Rendered	3698.84 KB	3698.72 KB	-0.13 KB (-0.00%)

➡️ nuxt-cli

Metric	Base	Head	Diff
Rendered	138.81 KB	138.81 KB	0.00 KB (0.00%)

➡️ create-nuxt

Metric	Base	Head	Diff
Rendered	1645.98 KB	1645.98 KB	0.00 KB (0.00%)