Bump test/go dependency

This replaces and closes https://github.com/apache/thrift/pull/2774.
diff --git a/test/go/go.mod b/test/go/go.mod
index 0143eba..ff88c9b 100644
--- a/test/go/go.mod
+++ b/test/go/go.mod
@@ -9,7 +9,7 @@
 
 require (
 	golang.org/x/mod v0.4.2 // indirect
-	golang.org/x/sys v0.0.0-20210510120138-977fb7262007 // indirect
+	golang.org/x/sys v0.7.0 // indirect
 	golang.org/x/tools v0.1.1 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 )