Update the method based on API feedback

UserHandle.getUid() is updated to a non-static API based on API
review feedback. Update the usage accordingly.

Bug: 184735865
Test: atest VpnTest
Change-Id: I884f427fae85b2b26973a0315b1ccf3d6f0824c6
diff --git a/tests/cts/hostside/app/src/com/android/cts/net/hostside/VpnTest.java b/tests/cts/hostside/app/src/com/android/cts/net/hostside/VpnTest.java
index c0600e7..29efb74 100755
--- a/tests/cts/hostside/app/src/com/android/cts/net/hostside/VpnTest.java
+++ b/tests/cts/hostside/app/src/com/android/cts/net/hostside/VpnTest.java
@@ -722,7 +722,8 @@
         final TestableNetworkCallback otherUidCallback = new TestableNetworkCallback();
         final TestableNetworkCallback myUidCallback = new TestableNetworkCallback();
         if (SdkLevel.isAtLeastS()) {
-            final int otherUid = UserHandle.getUid(UserHandle.of(5), Process.FIRST_APPLICATION_UID);
+            final int otherUid =
+                    UserHandle.of(5 /* userId */).getUid(Process.FIRST_APPLICATION_UID);
             final Handler h = new Handler(Looper.getMainLooper());
             runWithShellPermissionIdentity(() -> {
                 mCM.registerSystemDefaultNetworkCallback(systemDefaultCallback, h);