Update @github/copilot to 1.0.71 (#1998) #3099

Job	Run time
.NET SDK Tests (macos-latest, default)	9m 16s
.NET SDK Tests (ubuntu-latest, default)	9m 37s
.NET SDK Tests (windows-latest, default)	21m 33s
.NET SDK Tests (macos-latest, inprocess)	8m 56s
.NET SDK Tests (ubuntu-latest, inprocess)	9m 32s
	58m 54s

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