Just use default instance of scheduler

Also rekick CI

Author: ZacSweers

src/test/java/rx/schedulers/ResetSchedulersTest.java

@@ -13,7 +13,6 @@ public class ResetSchedulersTest {
 
     @Test
     public void reset() {
-        RxJavaSchedulersHook originalHook = RxJavaPlugins.getInstance().getSchedulersHook();
         RxJavaPlugins.getInstance().reset();
 
         final TestScheduler testScheduler = new TestScheduler();
@@ -40,7 +39,7 @@ public Scheduler getNewThreadScheduler() {
         assertTrue(Schedulers.newThread().equals(testScheduler));
 
         RxJavaPlugins.getInstance().reset();
-        RxJavaPlugins.getInstance().registerSchedulersHook(originalHook);
+        RxJavaPlugins.getInstance().registerSchedulersHook(RxJavaSchedulersHook.getDefaultInstance());
         Schedulers.reset();
 
         assertTrue(Schedulers.io() instanceof CachedThreadScheduler);