Update Skia milestone to 104

Change-Id: Iafd9cf15ac3c42bda7fa6b6857a82dc2eae6d234
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/540296
Reviewed-by: Heather Miller <hcm@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
Commit-Queue: Heather Miller <hcm@google.com>
diff --git a/include/core/SkMilestone.h b/include/core/SkMilestone.h
index 63e79f0..daae543 100644
--- a/include/core/SkMilestone.h
+++ b/include/core/SkMilestone.h
@@ -5,5 +5,5 @@
  * found in the LICENSE file.
  */
 #ifndef SK_MILESTONE
-#define SK_MILESTONE 103
+#define SK_MILESTONE 104
 #endif