mode: add mainnet L2 fork times to genesis.json config

Add the post-Regolith OP-stack fork activation timestamps (canyon through
karst) to op/mode/mainnet/genesis.json, sourced from the authoritative
copy running on rpc-de-32 (sha256 ea320f6a). The committed genesis was
missing every fork time after regolithTime, so op-reth could not apply
the L2 hardfork schedule.

canyonTime=shanghaiTime=1704992401, deltaTime=1708560000,
ecotoneTime=1710374401, fjordTime=1720627201, graniteTime=1726070401,
holoceneTime=1736445601, isthmusTime=1746806401, jovianTime=1764691201,
karstTime=1783526401.

op/mode/mainnet/genesis.json

@@ -17,6 +17,16 @@
     "mergeNetsplitBlock": 0,
     "bedrockBlock": 0,
     "regolithTime": 0,
+    "canyonTime": 1704992401,
+    "shanghaiTime": 1704992401,
+    "deltaTime": 1708560000,
+    "ecotoneTime": 1710374401,
+    "fjordTime": 1720627201,
+    "graniteTime": 1726070401,
+    "holoceneTime": 1736445601,
+    "isthmusTime": 1746806401,
+    "jovianTime": 1764691201,
+    "karstTime": 1783526401,
     "terminalTotalDifficulty": 0,
     "terminalTotalDifficultyPassed": true,
     "optimism": {