chore: replace wildcard imports in CustomFeeLimitTest (#2663)

Signed-off-by: kimhieu-dev <nguyenkimhieu.dev@gmail.com>

Author: kimhieu-dev

sdk/src/test/java/com/hedera/hashgraph/sdk/CustomFeeLimitTest.java

@@ -1,7 +1,8 @@
 // SPDX-License-Identifier: Apache-2.0
 package com.hedera.hashgraph.sdk;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 
 import com.google.protobuf.InvalidProtocolBufferException;
 import com.hedera.hashgraph.sdk.proto.CustomFeeLimit;