chore: Update outdated GitHub Actions versions

[pgoslatara]

Description

Updated GitHub Action versions to v6 in multiple workflows to ensure compatibility with the latest GitHub Actions platform.

Requirements / Checklist

• Read the Contributing Guidelines
• I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan.
  Issue number where discussion took place: #xxx
• If this contains a font/glyph add its origin as background info below (e.g. URL)
• Verified the license of any newly added font, glyph, or glyph set. License is: MIT (assuming standard license for GitHub Actions)

What does this PR do?

Updated GitHub Action versions in multiple workflows to v6, addressing outdated dependencies and ensuring compatibility with the latest GitHub Actions platform.

How should this be manually tested?

Will be tested in the CI pipeline of the pull request.

Any background context you can provide?

The update aligns with the latest GitHub Actions release, ensuring consistent behavior across workflows that use the actions/checkout and actions/upload-artifact actions.

What are the relevant tickets (if any)?

None applicable.

Screenshots (if appropriate or helpful)

[Finii]

Will be tested in the CI pipeline of the pull request.

Well, only the workflows that run an pulls will be tested.
For example we had a breaking change when updating upload-artifact from v3 to v4 (used in the release workflow)

to ensure compatibility with the latest GitHub Actions platform

To my understanding we do not need to update unless there is a warning (like we had in the past).
Of course updating is always good, but one needs to read the changelog closely, and not 'just try it out'. If the release breaks this means nightmare for me on release time. One release workflow runs several hours, so one should be certain it is ok...

[Finii]

All actions we use, from->to:

actions/checkout@v4                                 6
actions/download-artifact@v4                        7 
actions/upload-artifact@v4                          6
dessant/lock-threads@v5                             6 
docker/build-push-action@v5                         6
docker/login-action@v3                             (3) 
docker/metadata-action@v5                          (5) 
docker/setup-buildx-action@v3                      (3) 
docker/setup-qemu-action@v3                        (3) 
EndBug/add-and-commit@v9                           (9) 
EndBug/latest-tag@v1                               (1) 
JamesIves/github-pages-deploy-action@v4            (4) 
softprops/action-gh-release@v2                     (2) 

[Finii]

Thanks for the PR!

[Finii]

@allcontributors please add @pgoslatara for maintenance

[allcontributors]

@Finii

I've put up a pull request to add @pgoslatara! 🎉