Update github-actions (major)

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
Eomm/why-don-t-you-tweet	action	major	v1 -> v2
actions/checkout	action	major	v4 -> v6
actions/download-artifact	action	major	v4 -> v6
actions/upload-artifact	action	major	v4 -> v5
actions/upload-pages-artifact	action	major	v3 -> v4
peter-evans/create-pull-request	action	major	v6 -> v8

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Release Notes

Eomm/why-don-t-you-tweet (Eomm/why-don-t-you-tweet)

v2

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actions/checkout (actions/checkout)

v6

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v5

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

v6

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v5

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

v5

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

v4

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peter-evans/create-pull-request (peter-evans/create-pull-request)

v8

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v7

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