Replace dead beaconstate.info checkpoint-sync domains

- mainnet.beaconstate.info -> beaconstate.ethstaker.cc
- sepolia.beaconstate.info -> checkpoint-sync.sepolia.ethpandaops.io
- Preserve holesky.beaconstate.info and beaconstate-hoodi.chainsafe.io (alive)

Fixes CL container crash-loops on fresh starts due to dead DNS.

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

ethereum/geth/ethereum-mainnet-geth-pruned-pebble-path.yml

@@ -112,7 +112,7 @@ services:
     command:
       - --accept-terms-of-use
       - --beacon-db-pruning
-      - --checkpoint-sync-url=https://mainnet.beaconstate.info
+      - --checkpoint-sync-url=https://beaconstate.ethstaker.cc
       - --datadir=/data
       - --enable-historical-state-representation=false
       - --execution-endpoint=http://ethereum-mainnet-geth:8551