Remove unused import

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: RyanHealey

client/src/main/java/com/lmax/solana4j/client/jsonrpc/VoteAccountDTO.java

@@ -5,8 +5,6 @@
 import com.lmax.solana4j.client.api.VoteAccount;
 
 import java.util.List;
-import java.util.stream.Collectors;
-
 /**
  * Data Transfer Object for vote account information from the getVoteAccounts RPC call.
  */