chore(deps): update actions/download-artifact action to v4.1.8

Author: renovate[bot]

.github/workflows/reusable-tox.yml

@@ -263,7 +263,7 @@ jobs:
     - name: Download all the dists
       if: >-
         contains(fromJSON('["metadata-validation", "pytest"]'), inputs.toxenv)
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
       with:
         name: ${{ inputs.dists-artifact-name }}
         path: dist/