Add Sepolia TTD and DNS (#4024)

* added TTD and DNS to sepolia config file

Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Additions and Improvements
 - Version information available in metrics [#3997](https://github.com/hyperledger/besu/pull/3997)
+- Add TTD and DNS to Sepolia config [#4024](https://github.com/hyperledger/besu/pull/4024)
 
 ### Bug Fixes
 - Fixed a snapsync issue that can sometimes block the healing step [#3920](https://github.com/hyperledger/besu/pull/3920)

config/src/main/resources/sepolia.json

@@ -11,9 +11,10 @@
     "istanbulBlock":0,
     "berlinBlock":0,
     "londonBlock":0,
-    "terminalTotalDifficulty": 100000000000000000000000,
+    "terminalTotalDifficulty": 17000000000000000,
     "ethash":{},
     "discovery": {
+      "dns": "enrtree://AKA3AM6LPBYEUDMVNU3BSVQJ5AD45Y7YPOHJLEF6W26QOE4VTUDPE@all.sepolia.ethdisco.net",
       "bootnodes": [
         "enode://9246d00bc8fd1742e5ad2428b80fc4dc45d786283e05ef6edbd9002cbc335d40998444732fbe921cb88e1d2c73d1b1de53bae6a2237996e9bfe14f871baf7066@18.168.182.86:30303",
         "enode://ec66ddcf1a974950bd4c782789a7e04f8aa7110a72569b6e65fcd51e937e74eed303b1ea734e4d19cfaec9fbff9b6ee65bf31dcb50ba79acce9dd63a6aca61c7@52.14.151.177:30303"