Relax vexplain test for upcoming changes

The fix in vitessio#16988 makes a change
here that's not really a breaking change, but it does break the test as
the test matches the exact string output which changes here due to a
binary value.

Signed-off-by: Dirkjan Bussink <[email protected]>

go/test/endtoend/vtgate/queries/vexplain/vexplain_test.go

@@ -53,6 +53,7 @@ func start(t *testing.T) (*mysql.Conn, func()) {
 }
 
 func TestVtGateVExplain(t *testing.T) {
+	t.Skip("v22 changes the output of vexplain queries because of binary bind vars which breaks this test.")
 	conn, closer := start(t)
 	defer closer()