Build

Update to ImageSharp v3.1.12 #68

Job	Run time
Build (ubuntu-latest, net8.0, -x64, false)	42s
Build (windows-latest, net8.0, -x64, false)	46s
Build (macos-latest, net8.0, -x64, false)	57s
Publish	0s
	2m 25s

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