chore: bump list version to 2.15.0

Author: alfetopito

Diff for: src/public/CowSwap.json

@@ -1,9 +1,9 @@
 {
   "name": "CoW Swap",
-  "timestamp": "2023-08-01T13:00:00+00:00",
+  "timestamp": "2023-08-28T10:00:00+00:00",
   "version": {
     "major": 2,
-    "minor": 14,
+    "minor": 15,
     "patch": 0
   },
   "logoURI": "https://raw.githubusercontent.com/cowprotocol/token-lists/main/src/public/images/list-logo.png",