Bump xarray from 2023.7.0 to 2023.8.0 (#201) #550

Job	Run time
Create Example List	7s
Run Example: (fluorescence)	1m 28s
Run Example: (transient-absorption)	2m 36s
Run Example: (transient-absorption-two-datasets)	4m 27s
Run Example: (spectral-constraints)	1m 58s
Run Example: (spectral-guidance)	2m 21s
Run Example: (two-datasets)	1m 50s
Run Example: (sim-3d-disp)	3m 36s
Run Example: (sim-3d-nodisp)	2m 37s
Run Example: (sim-3d-weight)	2m 23s
Run Example: (sim-6d-disp)	2m 35s
Run Example: (doas-beta)	2m 51s
	28m 49s

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