Increased the timeout from 5 to 30 seconds

Increase the timeout to deal with the flaky test.

Bug: 260073439
Test: TH

Change-Id: I653d80cfa97256e139f8cf989a085b1133732092

tests/unit/java/android/net/ConnectivityManagerTest.java

@@ -498,7 +498,7 @@ public class ConnectivityManagerTest {
     public void testConnectivityManagerDoesNotLeakContext() throws Exception {
         final WeakReference<Context> ref = makeConnectivityManagerAndReturnContext();
 
-        final int attempts = 100;
+        final int attempts = 600;
         final long waitIntervalMs = 50;
         for (int i = 0; i < attempts; i++) {
             forceGC();