Add warning suppression.

src/main/java/com/zaxxer/hikari/pool/ProxyConnection.java

@@ -196,7 +196,7 @@ public abstract class ProxyConnection implements Connection
       final int size = openStatements.size();
       if (size > 0) {
          for (int i = 0; i < size && delegate != ClosedConnection.CLOSED_CONNECTION; i++) {
-            try (Statement statement = openStatements.get(i)) {
+            try (Statement ignored = openStatements.get(i)) {
                // automatic resource cleanup
             }
             catch (SQLException e) {