[test] update expected signature in HMAC SHA-256 test

hertzbeat-alerter/src/main/java/org/apache/hertzbeat/alert/util/CryptoUtils.java

@@ -88,7 +88,7 @@ public class CryptoUtils {
      * @return lowercase hexadecimal string
      */
     public static String hmacSha256Hex(String key, String data) {
-        return hmacSha256Hex(hmac256(key.getBytes(UTF8), data), data);
+        return hmacSha256Hex(key.getBytes(UTF8), data);
     }
 
     /**

hertzbeat-alerter/src/test/java/org/apache/hertzbeat/alert/util/CryptoUtilsTest.java

@@ -42,7 +42,7 @@ public class CryptoUtilsTest {
     @Test
     void testHmacSha256Hex() {
         String signature = CryptoUtils.hmacSha256Hex("your-real-key", "your-real-data");;
-        assertEquals("41878ccd7ecd795a2dd7ec39be7f33fed4be3ec75f5307689e39dd6f41fdbaac", signature);
+        assertEquals("f09adf5f4bf94eddecf0f7c8f39a3a8dc7f95ccdc2faf2e5330bc5a78e4bba95", signature);
     }
 
 }