style: delete unused import

Author: m-a-king

src/main/java/com/somemore/auth/jwt/generator/HmacJwtGenerator.java

@@ -2,7 +2,6 @@
 
 import com.somemore.auth.jwt.domain.EncodedToken;
 import com.somemore.auth.jwt.domain.TokenType;
-import com.somemore.auth.jwt.refresh.manager.RefreshTokenManager;
 import io.jsonwebtoken.Claims;
 import io.jsonwebtoken.Jwts;
 import io.jsonwebtoken.security.MacAlgorithm;