Bump sphinx-gallery from 0.13.0 to 0.14.0 in /requirements #565

Job	Run time
Build documentation	4m 26s
Build wheels on MacOS	0s
Build and Test (3.8, ubuntu-latest)	3m 57s
Build and Test (3.8, windows-latest)	4m 35s
Build and Test (3.9, ubuntu-latest)	4m 12s
Build and Test (3.9, windows-latest)	4m 42s
Build and Test (3.10, ubuntu-latest)	3m 57s
Build and Test (3.10, windows-latest)	4m 39s
Build and Test (3.11, ubuntu-latest)	4m 8s
Build and Test (3.11, windows-latest)	5m 27s
Upload development documentation	0s
Release	0s
Upload release documentation	0s
	40m 3s

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