Bump matplotlib from 3.7.2 to 3.8.0 #567

Job	Run time
Create Example List	4s
Run Example: (fluorescence)	1m 13s
Run Example: (transient-absorption)	2m 41s
Run Example: (transient-absorption-two-datasets)	3m 8s
Run Example: (spectral-constraints)	1m 35s
Run Example: (spectral-guidance)	2m 4s
Run Example: (two-datasets)	2m 10s
Run Example: (sim-3d-disp)	2m 33s
Run Example: (sim-3d-nodisp)	2m 46s
Run Example: (sim-3d-weight)	2m 31s
Run Example: (sim-6d-disp)	4m 4s
Run Example: (doas-beta)	2m 53s
	27m 42s

Provide feedback