Bump actions/download-artifact from 3 to 4 (arduino-libraries#33)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/compile-examples.yml

@@ -96,7 +96,7 @@ jobs:
       - name: Download sketches reports artifact
         id: download-artifact
         continue-on-error: true # If compilation failed for all boards then there are no artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ env.SKETCHES_REPORTS_ARTIFACT_NAME }}
           path: ${{ env.SKETCHES_REPORTS_PATH }}

.github/workflows/sync-labels.yml

@@ -114,7 +114,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Download configuration files artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ env.CONFIGURATIONS_ARTIFACT }}
           path: ${{ env.CONFIGURATIONS_FOLDER }}