ci: bump GitHub Actions to newest majors (checkout v6, wrangler-action v4)

Author: nx10

.github/workflows/deploy.yml

@@ -11,10 +11,10 @@ jobs:
       contents: read
       deployments: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Deploy to Cloudflare Pages
-        uses: cloudflare/wrangler-action@v3
+        uses: cloudflare/wrangler-action@v4
         with:
           apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
           accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}