chore(deps): update github artifact actions to v8

Author: renovate[bot]

.github/workflows/website.yml

@@ -319,7 +319,7 @@ jobs:
         mdbook build
 
     - name: Download WASM artifacts
-      uses: actions/download-artifact@v5
+      uses: actions/download-artifact@v8
       with:
         pattern: wasm-*
         path: wasm-artifacts