integration/TestUpdateMemory: fix false failure
This fixes the following test failure:
> --- FAIL: TestUpdateMemory (0.53s)
>  	assertions.go:226:
>	Error Trace:	update_linux_test.go:52
>	Error:      	Not equal:
>	            	expected: int(524288000)
>	            	received: int64(524288000)
Fixes:
@@ -35,7 +35,7 @@ func TestUpdateMemory(t *testing.T) {
const (
setMemory int64 = 314572800
- setMemorySwap = 524288000
+ setMemorySwap int64 = 524288000
)
_, err := client.ContainerUpdate(ctx, cID, containertypes.UpdateConfig{
