Suppress warnings in preparation for Checker Framework 3.3.0 upgrade.

PiperOrigin-RevId: 305810757

extensions/cronet/src/main/java/com/google/android/exoplayer2/ext/cronet/CronetEngineWrapper.java

@@ -166,7 +166,8 @@ public final class CronetEngineWrapper {
     private final boolean preferGMSCoreCronet;
 
     // Multi-catch can only be used for API 19+ in this case.
-    @SuppressWarnings("UseMultiCatch")
+    // incompatible types in argument.
+    @SuppressWarnings({"UseMultiCatch", "nullness:argument.type.incompatible"})
     public CronetProviderComparator(boolean preferGMSCoreCronet) {
       // GMSCore CronetProvider classes are only available in some configurations.
       // Thus, we use reflection to copy static name.

library/core/src/main/java/com/google/android/exoplayer2/source/MergingMediaPeriod.java

@@ -96,6 +96,8 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
     return Assertions.checkNotNull(trackGroups);
   }
 
+  // unboxing a possibly-null reference streamPeriodIndices.get(streams[i])
+  @SuppressWarnings("nullness:unboxing.of.nullable")
   @Override
   public long selectTracks(
       @NullableType TrackSelection[] selections,