chore(deps): update actions/download-artifact action to v8

Author: renovate[bot]

.github/workflows/post-pr-reviews.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
       - name: Create a .git directory needed by reviewdog
         run: git init
-      - uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
+      - uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8.0.0
         id: diff
         continue-on-error: true
         with: