Update @github/copilot to 1.0.71 #3092

Job	Run time
.NET SDK Tests (macos-latest, inprocess)	40s
.NET SDK Tests (macos-latest, default)	53s
.NET SDK Tests (ubuntu-latest, default)	2m 40s
.NET SDK Tests (ubuntu-latest, inprocess)	2m 55s
.NET SDK Tests (windows-latest, default)	1m 42s
	8m 50s

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