Move @Creator to a new appropriate constructor (#1440)

* Adds missing @Creator so Serde knows which constructor to use when deserializing

* Create an appropriate constructor receiving both grant_type and refresh_token to correctly deserialize with Serde

security-jwt/src/main/java/io/micronaut/security/token/jwt/endpoints/TokenRefreshRequest.java

@@ -50,12 +50,22 @@ public TokenRefreshRequest() { }
      *
      * @param refreshToken Refresh token
      */
-    @Creator
     public TokenRefreshRequest(String refreshToken) {
         this.grantType = GRANT_TYPE_REFRESH_TOKEN;
         this.refreshToken = refreshToken;
     }
 
+    /**
+     *
+     * @param grantType Grant type
+     * @param refreshToken Refresh token
+     */
+    @Creator
+    public TokenRefreshRequest(String grantType, String refreshToken) {
+        this.grantType = grantType;
+        this.refreshToken = refreshToken;
+    }
+
     /**
      * grantType getter.
      * @return e.g refresh_token