Author extract using correct as-at state (#5598)

* Author extract using correct as-at state

* Align header retrieval

* Dedupe

* Deupe

* Adjust

* Remove deprecated events.at

* 10.3.4

packages/api-base/package.json

@@ -18,11 +18,11 @@
     "./detectPackage.cjs"
   ],
   "type": "module",
-  "version": "10.3.3",
+  "version": "10.3.4",
   "main": "index.js",
   "dependencies": {
-    "@polkadot/rpc-core": "10.3.3",
-    "@polkadot/types": "10.3.3",
+    "@polkadot/rpc-core": "10.3.4",
+    "@polkadot/types": "10.3.4",
     "@polkadot/util": "^11.1.3",
     "rxjs": "^7.8.0",
     "tslib": "^2.5.0"