[C++ SDK] Fixed topic tests build on darwin (#20613)

Author: Gazizonoki

ydb/public/sdk/cpp/src/client/topic/ut/local_partition_ut.cpp

@@ -305,7 +305,7 @@ namespace NYdb::inline Dev::NTopic::NTests {
 
             UNIT_ASSERT(writeSession->Write(NPQ::NTest::Msg("message_1.1", 2)));
 
-            std::uint64_t txId = 1006;
+            ui64 txId = 1006;
             NPQ::NTest::SplitPartition(setup, ++txId, 0, "a");
 
             UNIT_ASSERT(writeSession->Write(NPQ::NTest::Msg("message_1.2", 3)));

ydb/public/sdk/cpp/src/client/topic/ut/topic_to_table_ut.cpp

@@ -396,7 +396,7 @@ class TFixture : public NUnitTest::TBaseFixture {
     std::unordered_map<std::pair<std::string, std::string>, TTopicWriteSessionContext> TopicWriteSessions;
     std::unordered_map<std::string, TTopicReadSessionPtr> TopicReadSessions;
 
-    std::uint64_t SchemaTxId = 1000;
+    ui64 SchemaTxId = 1000;
 };
 
 class TFixtureTable : public TFixture {