v1.12.6
CI: Use Dependabot to update GitHub Actions in this repo, and pin all external GitHub Actions to full-length commit hashes (#55283)
[release-1.12] Bump actions/checkout from 4.1.7 to 6.0.2
[release-1.12] Bump julia-actions/setup-julia from 2.6.1 to 2.7.0