SK-2467: fix linting issue

Author: skyflow-himanshu

src/main/java/com/skyflow/serviceaccount/util/SignedDataTokenResponse.java

@@ -4,13 +4,13 @@
 import com.skyflow.utils.Constants;
 
 public class SignedDataTokenResponse {
-    private static final String prefix = Constants.SIGNED_DATA_TOKEN_PREFIX;
+    private static final String PREFIX = Constants.SIGNED_DATA_TOKEN_PREFIX;
     private final String token;
     private final String signedToken;
 
     public SignedDataTokenResponse(String token, String signedToken) {
         this.token = token;
-        this.signedToken = new StringBuilder(prefix).append(signedToken).toString();
+        this.signedToken = new StringBuilder(PREFIX).append(signedToken).toString();
     }
 
     public String getToken() {