Update CMake version for AV1 extension

The specified CMake version doesn't work with the latest
Android Studio releases. Updating to a more recent version
fixes the problem.

Issue: google/ExoPlayer#9933
PiperOrigin-RevId: 467634063

Author: tonihei

RELEASENOTES.md

@@ -59,6 +59,10 @@
 *   FFmpeg extension:
     *   Add newly required flags to link FFmpeg libraries with NDK 23.1.7779620
         and above ([#9933](https://github.com/google/ExoPlayer/issues/9933)).
+*   AV1 extension:
+    *   Update CMake version to avoid incompatibilities with the latest Android
+        Studio releases
+        ([#9933](https://github.com/google/ExoPlayer/issues/9933)).
 
 ### 1.0.0-beta02 (2022-07-21)
 

libraries/decoder_av1/build.gradle

@@ -32,7 +32,7 @@ android {
 if (project.file('src/main/jni/libgav1').exists()) {
     android.externalNativeBuild.cmake {
         path = 'src/main/jni/CMakeLists.txt'
-        version = '3.7.1+'
+        version = '3.21.0+'
         if (project.hasProperty('externalNativeBuildDir')) {
             if (!new File(externalNativeBuildDir).isAbsolute()) {
                 ext.externalNativeBuildDir =

libraries/decoder_av1/src/main/jni/CMakeLists.txt

@@ -14,7 +14,8 @@
 # limitations under the License.
 #
 
-cmake_minimum_required(VERSION 3.7.1 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.21.0 FATAL_ERROR)
+
 set(CMAKE_CXX_STANDARD 11)
 
 project(libgav1JNI C CXX)