Chore: Bump docker/setup-buildx-action from 3.11.1 to 3.12.0

Chore: Bump docker/setup-buildx-action from 3.11.1 to 3.12.0

Bumps docker/setup-buildx-action from 3.11.1 to 3.12.0.
## Release notes

Sourced from docker/setup-buildx-action's releases.

v3.12.0

Deprecate install input by @​crazy-max in docker/setup-buildx-action#455
Bump @​docker/actions-toolkit from 0.62.1 to 0.63.0 in docker/setup-buildx-action#434
Bump brace-expansion from 1.1.11 to 1.1.12 in docker/setup-buildx-action#436
Bump form-data from 2.5.1 to 2.5.5 in docker/setup-buildx-action#432
Bump undici from 5.28.4 to 5.29.0 in docker/setup-buildx-action#435

Full Changelog: https://github.com/docker/setup-buildx-action/compare/v3.11.1...v3.12.0

## Commits

8d2750c Merge pull request #455 from crazy-max/install-deprecated
e81846b deprecate install input
65d18f8 Merge pull request #454 from docker/dependabot/github_actions/actions/checkout-6
000d75d build(deps): bump actions/checkout from 5 to 6
1583c0f Merge pull request #443 from nicolasleger/patch-1
ed158e7 doc: bump actions/checkout from 4 to 5
4cc794f Merge pull request #441 from docker/dependabot/github_actions/actions/checkout-5
4dfc3d6 build(deps): bump actions/checkout from 4 to 5
af1b253 Merge pull request #440 from crazy-max/k3s-build
3c6ab92 ci: k3s test with latest buildx
Additional commits viewable in compare view

![Dependabot compatibility score](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Issue-ID: CIMAN-33
Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: oran.gh2gerrit <releng+oran-gh2gerrit@linuxfoundation.org>
Change-Id: I9f779ffb3e28caa707475984b6b0d98f8c3f9343
GitHub-PR: https://github.com/o-ran-sc/it-dep/pull/28
GitHub-Hash: 856e8b8d6999c089