Update versions: java-tron v4.8.1, dshackle 0.75.6, hashkeychain config

Co-Authored-By: Claude Agent <claude@stakesquid.eu>

op/geth/hashkeychain-testnet-op-geth-pruned-pebble-path.yml

@@ -54,7 +54,7 @@ services:
       - 8551
     environment:
       - GETH_ROLLUP_DISABLETXPOOLGOSSIP=true
-      - GETH_ROLLUP_SEQUENCERHTTP=https://hashkeychain-testnet.alt.technology
+      - GETH_ROLLUP_SEQUENCERHTTP=https://testnet.hsk.xyz
     entrypoint: /bin/sh -c '[ ! -f /config/genesis.json ] && wget -qO /config/genesis.json "https://hashkeychain.s3.ap-southeast-1.amazonaws.com/testnet/genesis.json"; [ ! -d /data/geth ] && geth --gcmode=full --db.engine=pebble --datadir /data init --state.scheme=path /config/genesis.json; exec geth "$@"' --
     command:
       - --datadir=/data