Update @github/copilot to 1.0.71 #3098

Job	Run time
.NET SDK Tests (ubuntu-latest, default)	9m 31s
.NET SDK Tests (macos-latest, default)	8m 25s
.NET SDK Tests (ubuntu-latest, inprocess)	9m 44s
.NET SDK Tests (windows-latest, default)	21m 37s
.NET SDK Tests (macos-latest, inprocess)	10m 0s
	59m 17s

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