Migrate static imports of org.mockito.Matchers to org.mockito.ArgumentMatchers

The former is deprecated and replaced by the latter in Mockito 2.

For more information see go/mockito-2-lsc

Tested:
    TAP --sample ran all affected tests and none failed
    http://test/OCL:292555754:BASE:292543534:1580490509580:bfdfdd31
PiperOrigin-RevId: 292881633

extensions/cronet/src/test/java/com/google/android/exoplayer2/ext/cronet/CronetDataSourceTest.java

@@ -19,7 +19,7 @@ import static com.google.common.truth.Truth.assertThat;
 import static org.junit.Assert.fail;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyString;
-import static org.mockito.Matchers.eq;
+import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.mock;