the address is https://sepolia.etherscan.io
https://api-sepolia.etherscan.io/

from https://docs.etherscan.io/getting-started/endpoint-urls

It won't be too hard I think modify enum io.api.etherscan.model.EthNetwork and io.api.etherscan.core.impl.EtherScanApi#EtherScanApi(java.lang.String, io.api.etherscan.model.EthNetwork, java.util.function.Supplier<io.api.etherscan.executor.IHttpExecutor>, io.api.etherscan.manager.IQueueManager)
will be sufficient