chore(l1): update mainnet genesis file for fusaka (#5162)

**Motivation**
Upating values based on: eth-clients/mainnet#11

Author: mpaulucci

cmd/ethrex/networks/mainnet/genesis.json

@@ -23,7 +23,7 @@
     "cancunTime": 1710338135,
     "pragueTime": 1746612311,
     "osakaTime": 1764798551,
-    "bpo1Time": 1765978199,
+    "bpo1Time": 1765290071,
     "bpo2Time": 1767747671,
     "ethash": {},
     "depositContractAddress": "0x00000000219ab540356cBB839Cbe05303d7705Fa",