Update actions/checkout action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v5 -> v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

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[gitnotebooks]

Review these changes at https://app.gitnotebooks.com/AlphaSphereDotAI/visualizr/pull/411

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[deepsource-io]

Here's the code health analysis summary for commits f76c860..929004a. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success		View Check ↗
Docker	✅ Success		View Check ↗
Secrets	✅ Success		View Check ↗

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[mergify]

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[renovate]

Edited/Blocked Notification

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud