fix(deps): update dependency astro to v4 [security]

Author: renovate[bot]

package.json

@@ -26,7 +26,7 @@
     "@kiltprotocol/sdk-js": "^0.36.0-rc.4",
     "@polkadot/extension-dapp": "^0.60.1",
     "@polkadot/util": "^13.5.2",
-    "astro": "^3.6.5",
+    "astro": "^4.0.0",
     "dotenv": "^16.4.7",
     "got": "^12.6.1",
     "http-status-codes": "^2.3.0",