tests

Support dictionary cmaps for ImageStack #1930

Job	Run time
Run pre-commit	15s
Core tests on Python 3.12, ubuntu-latest	4m 26s
UI tests on Python 3.9, ubuntu-latest	2m 15s
Unit tests on Python 3.9, ubuntu-latest	26m 28s
Unit tests on Python 3.11, ubuntu-latest	25m 42s
Unit tests on Python 3.9, macos-latest	38m 44s
Unit tests on Python 3.11, macos-latest	52m 52s
Unit tests on Python 3.9, windows-latest	41m 25s
Unit tests on Python 3.11, windows-latest	46m 5s
Unit tests on Python 3.10, ubuntu-latest	24m 58s
	4h 23m 10s

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