Update actions dependencies and enable dependabot

[llucax]

• Update deprecated actions in CI workflow
• Add dependabot configuration to update GitHub Actions

[Copilot]

Pull Request Overview

This PR updates deprecated GitHub Actions in the CI workflow by pinning them to specific revisions and introduces a Dependabot configuration to keep actions up to date.

• Pin actions/checkout and actions/upload-artifact to explicit SHAs with version annotations
• Add .github/dependabot.yml to automate GitHub Actions dependency updates

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/ci.yml	Updated uses references for checkout and upload-artifact steps
.github/dependabot.yml	Added Dependabot config for github-actions ecosystem

Comments suppressed due to low confidence (2)

.github/workflows/ci.yml:8

• Pinning to a long commit SHA can hinder readability and future updates; consider using the official version tag (e.g., actions/checkout@v4) for clarity and maintainability.

        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

.github/dependabot.yml:6

• [nitpick] A semiannual update interval may delay critical fixes; consider a more frequent schedule (e.g., monthly or weekly) to keep dependencies current.

      interval: "semiannually"

[llucax]

Fixed the typo as suggested by copilot, needs a new approval @ibuclaw 🙏

[llucax]

Or maybe it didn't...

[ibuclaw]

🤷 It's the thought that counts.