Update golang.org/x/sync commit hash to 036812b

This MR contains the following updates:

Package	Type	Update	Change
golang.org/x/sync	require	digest	09787c9 -> 036812b

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go.mod

@@ -26,6 +26,6 @@ require (
 	go.opencensus.io v0.22.6
 	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
 	golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421 // indirect
-	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 )