Use uncaught_exceptions instead of removed in c++20 uncaught_exception (#16380)

Author: 4JustMe4

src/client/persqueue_public/ut/read_session_ut.cpp

@@ -595,7 +595,7 @@ TReadSessionImplTestSetup::TReadSessionImplTestSetup() {
 }
 
 TReadSessionImplTestSetup::~TReadSessionImplTestSetup() noexcept(false) {
-    if (!std::uncaught_exception()) { // Exiting from test successfully. Check additional expectations.
+    if (!std::uncaught_exceptions()) { // Exiting from test successfully. Check additional expectations.
         MockProcessorFactory->Wait();
         MockProcessor->Wait();