[#25407] DocDB: Fix PgGetLockStatusTest.ReceivesWaiterSubtransactionId in gcc11 fastdebug

Summary:
Increased kMinTxnAgeSeconds from 1s to 2s to make test more stable.
Jira: DB-14639

Test Plan: ./yb_build.sh fastdebug --gcc11 --cxx-test pgwrapper_pg_get_lock_status-test --gtest_filter PgGetLockStatusTest.ReceivesWaiterSubtransactionId -n 40

Reviewers: bkolagani

Reviewed By: bkolagani

Subscribers: yql, ybase

Tags: #jenkins-ready

Differential Revision: https://phorge.dev.yugabyte.com/D40847

Author: spolitov

src/yb/yql/pgwrapper/pg_get_lock_status-test.cc

@@ -668,7 +668,7 @@ TEST_F(PgGetLockStatusTest, TestColocatedWaiterWriteLock) {
 TEST_F(PgGetLockStatusTest, ReceivesWaiterSubtransactionId) {
   const auto table = "foo";
   const auto locked_key = "1";
-  constexpr int kMinTxnAgeSeconds = 1;
+  constexpr int kMinTxnAgeSeconds = 2;
 
   auto blocker_session = ASSERT_RESULT(Init(table, locked_key));