deps(c#): Update dependency SixLabors.ImageSharp to 3.1.7 [SECURITY] #319

Job	Run time
runs-on (ubuntu-latest) / build (imagePipeline)	44s
runs-on (ubuntu-latest) / ReSharper	2m 11s
runs-on (ubuntu-latest) / build (crawler)	51s
runs-on (ubuntu-latest) / build (shared)	35s
runs-on (windows-latest) / ReSharper	5m 26s
runs-on (ubuntu-latest) / build (tbClient)	33s
runs-on (macos-latest) / build (crawler)	48s
runs-on (macos-latest) / ReSharper	1m 56s
runs-on (windows-latest) / build (tbClient)	1m 0s
runs-on (windows-latest) / build (shared)	1m 4s
runs-on (macos-latest) / build (tbClient)	44s
runs-on (windows-latest) / build (crawler)	1m 25s
runs-on (macos-latest) / build (imagePipeline)	47s
runs-on (macos-latest) / build (shared)	45s
runs-on (windows-latest) / build (imagePipeline)	1m 10s
	19m 59s

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