fix(l1): include the EIP-7843 slot-derivation knobs in the nodeInfo fixture

`ChainConfig` gained `derivedSlotTime`, `genesisTimestamp` and `secondsPerSlot`,
which serialize into the `admin_nodeInfo` chain config, but the expected JSON in
the RPC test was not updated alongside them.

Author: edg-l

crates/networking/rpc/rpc.rs

@@ -1812,6 +1812,9 @@ mod tests {
                             "bpo5Time": null,
                             "amsterdamTime": null,
                             "hegotaTime": null,
+                            "derivedSlotTime": null,
+                            "genesisTimestamp": null,
+                            "secondsPerSlot": null,
                             "terminalTotalDifficulty": "0x0",
                             "terminalTotalDifficultyPassed": true,
                             "blobSchedule": blob_schedule,