Update actions/download-artifact action to v8

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/main.yml

@@ -86,7 +86,7 @@ jobs:
       id-token: write  # IMPORTANT: mandatory for trusted publishing
     steps:
       - name: Download all the dists
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: python-package-distributions
           path: dist/
@@ -105,7 +105,7 @@ jobs:
 
     steps:
       - name: Download all the dists
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: python-package-distributions
           path: dist/