WebHost: fix host room not updating (ports in) slot table backport #21493

Job	Run time
Test hosting with 3.12 on ubuntu-latest	3m 10s
Test Python 3.8 ubuntu-latest	4m 55s
Test Python 3.9 ubuntu-latest	4m 20s
Test Python 3.10 ubuntu-latest	4m 6s
Test Python 3.11 ubuntu-latest	4m 21s
Test Python 3.12 ubuntu-latest	6m 0s
Test Python 3.8 windows-latest	6m 13s
Test Python 3.12 windows-latest	7m 47s
Test Python 3.12 macos-latest	3m 35s
	44m 27s

Provide feedback