Update holoviz_tasks to v0.1a15 #793

Job	Run time
Pip tests on ubuntu-latest with Python 3.10	52m 48s
Pip tests on macos-latest with Python 3.10	56m 54s
Tests on ubuntu-latest with Python 3.8	40m 49s
Tests on ubuntu-latest with Python 3.9	44m 3s
Tests on ubuntu-latest with Python 3.10	56m 59s
Tests on ubuntu-latest with Python 3.11	5m 22s
Tests on macos-latest with Python 3.8	1h 7m 18s
Tests on macos-latest with Python 3.9	1h 7m 6s
Tests on macos-latest with Python 3.10	1h 4m 49s
Tests on macos-latest with Python 3.11	4m 41s
Tests on windows-latest with Python 3.8	1h 12m 0s
Tests on windows-latest with Python 3.9	11m 22s
Tests on windows-latest with Python 3.10	1h 7m 12s
Tests on windows-latest with Python 3.11	1h 7m 15s
	11h 18m 38s

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