fix(spotbugs): update filter justifications and seal finalizer mitigation on TsaClient

modules/cybercore-core/src/main/java/br/com/cybercore/signer/core/crypto/tsa/TsaClient.java

@@ -29,7 +29,7 @@ import java.util.Objects;
  * Cliente resiliente de Carimbo do Tempo (TSA RFC 3161) com suporte a retentativas com backoff,
  * timeout configurável e fallback automático para servidores secundários.
  */
-public class TsaClient {
+public final class TsaClient {
 
     private static final Logger logger = LoggerFactory.getLogger(TsaClient.class);
     private static final SecureRandom SECURE_RANDOM = new SecureRandom();