add zksync mainnet and testnet (#2666)

Author: gfletcher-cll

public/changelog.json

@@ -282,6 +282,14 @@
     }
   },
   "data": [
+    {
+      "category": "integration",
+      "date": "2025-05-19",
+      "description": "Chainlink Functions is available on ZKSync Mainnet and Testnet. Visit the [Supported Networks](https://docs.chain.link/chainlink-functions/supported-networks#zksync) page for more information.",
+      "relatedNetworks": ["zksync"],
+      "title": "Functions on ZkSync",
+      "topic": "Functions"
+    },
     {
       "category": "integration",
       "date": "2025-05-19",