Update annotation-experimental version

This picks up a fix to ensure Android Studio puts the `@OptIn`
annotation in the correct place:
https://issuetracker.google.com/251172715

This also introduces a transitive dependency from `media3-common` on
the Kotlin standard library, so this CL also includes some updates to
the dev guide to document how apps can avoid including this dep if
they want.

PiperOrigin-RevId: 558821673

RELEASENOTES.md

@@ -62,6 +62,11 @@ This release includes the following changes since
         `PlayerView.setShowPlayButtonIfPlaybackIsSuppressed(false)` or
         `MediaSession.Builder.setShowPlayButtonIfPlaybackIsSuppressed(false)`
         ([#11213](https://github.com/google/ExoPlayer/issues/11213)).
+    *   Upgrade `androidx.annotation:annotation-experimental` to `1.3.1`. This
+        also introduces a transitive dependency on the Kotlin standard library
+        from `media3-common`. Apps can
+        [downgrade to remove this dependency if they want](https://developer.android.com/guide/topics/media/exoplayer/shrinking#remove-kotlin-dep).
+        Fixes https://issuetracker.google.com/251172715.
 *   ExoPlayer:
     *   Fix seeking issues in AC4 streams caused by not identifying decode-only
         samples correctly

constants.gradle

@@ -34,8 +34,7 @@ project.ext {
     kotlinAnnotationsVersion = '1.8.20'
     // Updating this to 1.4.0+ will import Kotlin stdlib [internal ref: b/277891049].
     androidxAnnotationVersion = '1.3.0'
-    // Updating this to 1.3.0+ will import Kotlin stdlib [internal ref: b/277891049].
-    androidxAnnotationExperimentalVersion = '1.2.0'
+    androidxAnnotationExperimentalVersion = '1.3.1'
     androidxAppCompatVersion = '1.6.1'
     androidxCollectionVersion = '1.2.0'
     androidxConstraintLayoutVersion = '2.1.4'

demos/main/build.gradle

@@ -72,6 +72,17 @@ android {
 dependencies {
     compileOnly 'org.checkerframework:checker-qual:' + checkerframeworkVersion
     implementation 'androidx.annotation:annotation:' + androidxAnnotationVersion
+    // Demonstrate downgrading the annotation-experimental version to avoid
+    // transitively depending on the Kotlin standard library (which was
+    // introduced as a dependency in annotation-experimental:1.3.0). This demo
+    // app still depends on Kotlin via the IMA extension and UI modules, but
+    // this shows how an app can avoid the Kotlin dependency if they don't use
+    // these modules.
+    implementation('androidx.annotation:annotation-experimental') {
+        version {
+            strictly '1.2.0'
+        }
+    }
     implementation 'androidx.appcompat:appcompat:' + androidxAppCompatVersion
     implementation 'androidx.multidex:multidex:' + androidxMultidexVersion
     implementation 'com.google.android.material:material:' + androidxMaterialVersion