update test in azure-security-keyvault-jca (Azure#25393)

Author: Rujun Chen

sdk/keyvault/azure-security-keyvault-jca/src/test/java/com/azure/security/keyvault/jca/implementation/utils/HttpUtilTest.java

@@ -19,7 +19,7 @@ public void getUserAgentPrefixTest() {
 
     @Test
     public void testCustomizedHttpsClient() {
-        String url = "https://google.com";
+        String url = "https://mvnrepository.com/";
         String result = HttpUtil.get(url, null);
         assertNotNull(result);
         assertFalse(result.isEmpty());

sdk/keyvault/azure-security-keyvault-keys/src/test/java/com/azure/security/keyvault/keys/KeyAsyncClientTest.java

@@ -36,7 +36,6 @@
 import java.time.Duration;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.UUID;
 
 import static com.azure.security.keyvault.keys.cryptography.TestHelper.DISPLAY_NAME_WITH_ARGUMENTS;
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;