Update patch version for release

New version is v0.2.4-dev

Change-Id: Ie95010295c4935b047881a3ead9fc1eb3bca9b04
diff --git a/src/main/java/com/android/tools/r8/Version.java b/src/main/java/com/android/tools/r8/Version.java
index 6a78145..6f062cf 100644
--- a/src/main/java/com/android/tools/r8/Version.java
+++ b/src/main/java/com/android/tools/r8/Version.java
@@ -11,7 +11,7 @@
 
   // 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 = "v1.2.3-dev";
+  public static final String LABEL = "v1.2.4-dev";
 
   private Version() {
   }