Improved image typings (#6064) #12

Job	Run time
Core Basic (18.x)	6m 21s
Core Basic (20.x)	7m 6s
Core Basic - Plone 5 (18.x)	6m 37s
Core Blocks (18.x)	7m 44s
Core Blocks - Listing (18.x)	4m 27s
Core Blocks (20.x)	7m 47s
Core Blocks - Listing (20.x)	4m 29s
Core Content (18.x)	3m 18s
Core Control Panels (18.x)	3m 54s
Core Content (20.x)	3m 20s
Core Control Panels (20.x)	4m 25s
Core Volto Slate (18.x)	7m 37s
Coresandbox (18.x)	4m 19s
Core Volto Slate (20.x)	6m 53s
Project Generator (18.x)	6m 57s
Multilingual (18.x)	3m 11s
Project Generator (20.x)	7m 10s
Seamless Mode (18.x)	6m 22s
Working Copy (18.x)	2m 54s
Multilingual in Seamless Mode (18.x)	3m 42s
	1h 48m 33s

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