Update GitHub Artifact Actions to v7

Author: renovate[bot]

.github/workflows/web.yml

@@ -91,7 +91,7 @@ jobs:
           RUSTFLAGS: --cfg getrandom_backend="unsupported"
         run: npm run build
       - name: Upload build artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: vortex-explorer
           path: vortex-web/dist/
@@ -107,7 +107,7 @@ jobs:
       name: github-pages
       url: ${{ steps.deploy.outputs.deployment-url }}
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v7
         with:
           name: vortex-explorer
           path: dist