message: Fix kokoro maven test.
diff: @@ -195,6 +195,7 @@ gen_maven_jar_rules(
  "//src/main/java/com/google/crypto/tink/mac:hmac_key",
  "//src/main/java/com/google/crypto/tink/mac:hmac_key_manager",
  "//src/main/java/com/google/crypto/tink/mac:hmac_parameters",
  + "//src/main/java/com/google/crypto/tink/mac:hmac_proto_serialization",
  "//src/main/java/com/google/crypto/tink/mac:mac_config",
  "//src/main/java/com/google/crypto/tink/mac:mac_factory",
  "//src/main/java/com/google/crypto/tink/mac:mac_key",
  @@ -502,6 +503,7 @@ gen_maven_jar_rules(
  "//src/main/java/com/google/crypto/tink/mac:hmac_key-android",
  "//src/main/java/com/google/crypto/tink/mac:hmac_key_manager-android",
  "//src/main/java/com/google/crypto/tink/mac:hmac_parameters-android",
  + "//src/main/java/com/google/crypto/tink/mac:hmac_proto_serialization-android",
  "//src/main/java/com/google/crypto/tink/mac:mac_config-android",
  "//src/main/java/com/google/crypto/tink/mac:mac_factory-android",
  "//src/main/java/com/google/crypto/tink/mac:mac_key-android",
  