Build against JupyterLab 4.1, fix tests #1696

Job	Run time
jstest/lint (ubuntu, >=20,<21, >=4.1.0,<5.0.0a0, >=4)	5m 6s
build (ubuntu, >=20,<21, >=4.1.0,<5.0.0a0, >=4)	2m 49s
atest ubuntu py3.8 r>=4	21m 30s
atest ubuntu py3.11 r>=4	21m 30s
smoke source install ubuntu py3.8 lab>=4.1.0,<5	1m 59s
atest macos py3.8 r>=4	21m 34s
smoke source install ubuntu py3.11 lab>=4.1.0,<5	1m 52s
atest macos py3.11 r>=4	21m 31s
atest windows py3.8 r>=4	11m 39s
atest windows py3.11 r>=4	9m 1s
smoke ubuntu py3.8	36s
smoke ubuntu py3.11	39s
smoke ubuntu pypypy-3.8	1m 28s
smoke macos py3.8	56s
smoke macos py3.11	44s
smoke macos pypypy-3.8	54s
smoke windows py3.8	2m 11s
smoke windows py3.11	1m 49s
smoke windows pypypy-3.8	6m 46s
	2h 14m 34s

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