chore: bump version to v6.1.0-lens-bsc.4

Author: alfetopito

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@cowprotocol/cow-sdk",
-  "version": "6.1.0-lens-bsc.3",
+  "version": "6.1.0-lens-bsc.4",
   "license": "(MIT OR Apache-2.0)",
   "files": [
     "/dist"