Upgrade OkHttp dependency to 3.12.8

OkHttp 3.12.7 introduced a regression, which was fixed in 3.12.8.

PiperOrigin-RevId: 291695577

RELEASENOTES.md

@@ -43,7 +43,7 @@
   ([#6845](https://github.com/google/ExoPlayer/issues/6845)).
 * Fix MKV subtitles to disappear when intended instead of lasting until the
   next cue ([#6833](https://github.com/google/ExoPlayer/issues/6833)).
-* OkHttp extension: Upgrade OkHttp dependency to 3.12.7, which fixes a class of
+* OkHttp extension: Upgrade OkHttp dependency to 3.12.8, which fixes a class of
   `SocketTimeoutException` issues when using HTTP/2
   ([#4078](https://github.com/google/ExoPlayer/issues/4078)).
 * FLAC extension: Fix handling of bit depths other than 16 in `FLACDecoder`.

extensions/okhttp/build.gradle

@@ -41,7 +41,7 @@ dependencies {
     // https://cashapp.github.io/2019-02-05/okhttp-3-13-requires-android-5
     // Since OkHttp is distributed as a jar rather than an aar, Gradle won't
     // stop us from making this mistake!
-    api 'com.squareup.okhttp3:okhttp:3.12.7'
+    api 'com.squareup.okhttp3:okhttp:3.12.8'
 }
 
 ext {