Update Skia milestone to 76

Change-Id: I146f97bd27d17bffd51fc572ecee84552b238e20
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209160
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 dee0c85..7b6e6f8 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 75
+#define SK_MILESTONE 76
 #endif