Bump version to 2.9.1

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=219609471

RELEASENOTES.md

@@ -18,6 +18,9 @@
   * Fix handling of streams with appended data
     ([#4954](https://github.com/google/ExoPlayer/issues/4954)).
 * DASH: Parse ProgramInformation element if present in the manifest.
+* HLS: Add constructor to `DefaultHlsExtractorFactory` for adding TS payload
+  reader factory flags
+  ([#4861](https://github.com/google/ExoPlayer/issues/4861)).
 * SubRip: Add support for alignment tags, and remove tags from the displayed
   captions ([#4306](https://github.com/google/ExoPlayer/issues/4306)).
 * Fix issue with blind seeking to windows with non-zero offset in a

constants.gradle

@@ -13,8 +13,8 @@
 // limitations under the License.
 project.ext {
     // ExoPlayer version and version code.
-    releaseVersion = '2.9.0'
-    releaseVersionCode = 2009000
+    releaseVersion = '2.9.1'
+    releaseVersionCode = 2009001
     // Important: ExoPlayer specifies a minSdkVersion of 14 because various
     // components provided by the library may be of use on older devices.
     // However, please note that the core media playback functionality provided

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerLibraryInfo.java

@@ -29,11 +29,11 @@ public final class ExoPlayerLibraryInfo {
 
   /** The version of the library expressed as a string, for example "1.2.3". */
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION_INT) or vice versa.
-  public static final String VERSION = "2.9.0";
+  public static final String VERSION = "2.9.1";
 
   /** The version of the library expressed as {@code "ExoPlayerLib/" + VERSION}. */
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION) or vice versa.
-  public static final String VERSION_SLASHY = "ExoPlayerLib/2.9.0";
+  public static final String VERSION_SLASHY = "ExoPlayerLib/2.9.1";
 
   /**
    * The version of the library expressed as an integer, for example 1002003.
@@ -43,7 +43,7 @@ public final class ExoPlayerLibraryInfo {
    * integer version 123045006 (123-045-006).
    */
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION) or vice versa.
-  public static final int VERSION_INT = 2009000;
+  public static final int VERSION_INT = 2009001;
 
   /**
    * Whether the library was compiled with {@link com.google.android.exoplayer2.util.Assertions}