Update GitHub Artifact Actions (major)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/download-artifact	action	major	v3 → v8
actions/upload-artifact	action	major	v3 → v7

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Release Notes

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

v8

Compare Source

v7

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v6

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v5

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v4

Compare Source

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

v7

Compare Source

v6

Compare Source

v5

Compare Source

v4

Compare Source

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