Handle Iopub welcome message for jep#65 #2203

Job	Run time
check_release	3m 14s
integration_check (ubuntu-latest, 3.8)	2m 34s
integration_check (ubuntu-latest, 3.9)	2m 30s
integration_check (ubuntu-latest, 3.10)	3m 0s
integration_check (ubuntu-latest, 3.11)	2m 52s
build (ubuntu-latest, 3.8)	7m 34s
build (ubuntu-latest, 3.11)	6m 6s
build (windows-latest, 3.8)	13m 42s
build (windows-latest, 3.11)	16m 42s
build (macos-latest, 3.8)	10m 8s
build (macos-latest, 3.11)	8m 16s
build (windows-latest, 3.9)	11m 49s
build (ubuntu-latest, pypy-3.8)	9m 29s
build (macos-latest, 3.10)	8m 34s
build (ubuntu-latest, 3.12)	7m 24s
Check Links	3m 19s
integration_check_pypy	1m 52s
Test Docs	1m 33s
Make SDist	35s
Test Examples	1m 15s
Test Lint	1m 38s
Test Prereleases	4m 36s
Test Minimum Versions	5m 35s
Install from SDist and Test	4m 3s
coverage	18s
tests_check	2s
	2h 18m 40s

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