Update golang.org/x/sync commit hash to 09787c9

This MR contains the following updates:

Package	Type	Update	Change
golang.org/x/sync	require	digest	43a5402 -> 09787c9

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go.mod

@@ -21,7 +21,7 @@ require (
 	github.com/tstranex/u2f v1.0.0
 	go.opencensus.io v0.22.3
 	golang.org/x/crypto v0.0.0-20200403201458-baeed622b8d8
-	golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a
+	golang.org/x/sync 09787c993a3a
 	gopkg.in/asn1-ber.v1 v1.0.0-20181015200546-f715ec2f112d
 	gopkg.in/ldap.v3 v3.1.0
 )