Bump SixLabors.ImageSharp from 3.1.4 to 3.1.5 in /c#/imagePipeline (#51) #145

Job	Run time
runs-on (ubuntu-latest) / ReSharper	1m 39s
runs-on (macos-latest) / build (crawler)	38s
runs-on (ubuntu-latest) / build (crawler)	44s
runs-on (macos-latest) / build (imagePipeline)	33s
runs-on (macos-latest) / ReSharper	1m 21s
runs-on (ubuntu-latest) / build (imagePipeline)	35s
runs-on (macos-latest) / build (shared)	43s
runs-on (windows-latest) / build (crawler)	2m 25s
runs-on (macos-latest) / build (tbClient)	30s
runs-on (ubuntu-latest) / build (shared)	39s
runs-on (windows-latest) / build (imagePipeline)	1m 14s
runs-on (ubuntu-latest) / build (tbClient)	34s
runs-on (windows-latest) / ReSharper	3m 20s
runs-on (windows-latest) / build (shared)	1m 57s
runs-on (windows-latest) / build (tbClient)	2m 15s
	19m 7s

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