chore(deps): update github artifact actions

Author: renovate[bot]

.github/workflows/website.yml

@@ -66,7 +66,7 @@ jobs:
               working-directory: book
 
             - name: Upload artifact
-              uses: actions/upload-artifact@v6
+              uses: actions/upload-artifact@v7
               with:
                   name: book
                   path: book/book
@@ -90,7 +90,7 @@ jobs:
                   fetch-depth: 0
 
             - name: Download artifacts
-              uses: actions/download-artifact@v7
+              uses: actions/download-artifact@v8
               with:
                   path: dist
                   merge-multiple: true