Version 8.3.21

Promote version 8.3.21-dev to 8.3.21.

Release branch for Android Studio 2023.2.1 (Iguana) / AGP 8.3.

Change-Id: I76a5d7d5d09b856b8e2461a766827f373075e9d9
diff --git a/src/main/java/com/android/tools/r8/Version.java b/src/main/java/com/android/tools/r8/Version.java
index 47edc86..710fbe5 100644
--- a/src/main/java/com/android/tools/r8/Version.java
+++ b/src/main/java/com/android/tools/r8/Version.java
@@ -13,7 +13,7 @@
 
   // This field is accessed from release scripts using simple pattern matching.
   // Therefore, changing this field could break our release scripts.
-  public static final String LABEL = "8.3.21-dev";
+  public static final String LABEL = "8.3.21";
 
   private Version() {
   }