Update Skia milestone to 80

TBR=reed

Change-Id: I121ad8cf68f4a42ba5285cef5c2f9d450ba7545b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/249123
Reviewed-by: Heather Miller <hcm@google.com>
Commit-Queue: Heather Miller <hcm@google.com>
Auto-Submit: Heather Miller <hcm@google.com>
diff --git a/include/core/SkMilestone.h b/include/core/SkMilestone.h
index 6ac2a14..44e9ef4 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 79
+#define SK_MILESTONE 80
 #endif