ci(deps): bump actions/download-artifact from 4 to 6 (#4)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v4...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/validate.yml

@@ -303,7 +303,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: ⬇️ Download Docker Image
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           name: docker-image
           path: /tmp
@@ -398,7 +398,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: ⬇️ Download Docker Image
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           name: docker-image
           path: /tmp
@@ -449,7 +449,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: ⬇️ Download Docker Image
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           name: docker-image
           path: /tmp