fix: Bug in Session_Transaction_Manager::pop_transaction_id() fixed #1068

Job	Run time
Running Automated Tests w/ WPBrowser in WordPress v6.3 on PHP8.1	3m 14s
Running Automated Tests w/ WPBrowser in WordPress v6.2 on PHP8.1 with HPOS activated	3m 18s
Running Automated Tests w/ WPBrowser in WordPress v6.1 on PHP8.1 in Debug Mode	3m 30s
Running Automated Tests w/ WPBrowser in WordPress v6.0 on PHP8.1	3m 29s
Running Automated Tests w/ WPBrowser in WordPress v6.3 on PHP8.0	3m 36s
Running Automated Tests w/ WPBrowser in WordPress v6.2 on PHP8.0 with HPOS activated	3m 29s
Running Automated Tests w/ WPBrowser in WordPress v6.1 on PHP8.0	3m 17s
Running Automated Tests w/ WPBrowser in WordPress v6.0 on PHP8.0	3m 20s
Running Automated Tests w/ WPBrowser in WordPress v6.3 on PHP7.4	1m 58s
Running Automated Tests w/ WPBrowser in WordPress v6.2 on PHP7.4 with HPOS activated with Codecoverage	1m 56s
Running Automated Tests w/ WPBrowser in WordPress v6.1 on PHP7.4	1m 27s
Running Automated Tests w/ WPBrowser in WordPress v6.0 on PHP7.4	1m 52s
	34m 26s

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