integration-test: Fix the kernel version chceck for smoke test

Before this chane, the check was always negative if the minor version
was less then 9. So, for example, the smoke test was skipped for kernel
6.1:

```
skipping as 6.1 does not meet version requirement of 5.9
```

Signed-off-by: Michal Rostecki <[email protected]>

test/integration-test/src/tests/smoke.rs

@@ -19,7 +19,7 @@ fn xdp() {
 #[integration_test]
 fn extension() {
     let (major, minor, _) = kernel_version().unwrap();
-    if major < 5 || minor < 9 {
+    if major < 5 || (minor == 5 && minor < 9) {
         info!(
             "skipping as {}.{} does not meet version requirement of 5.9",
             major, minor