Update to latest rive

Add two more test files -- to help diagnose metal blend modes

Change-Id: I4eca585fec812593dac5723175b530f73d44e441
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/564897
Commit-Queue: Florin Malita <fmalita@google.com>
Reviewed-by: Florin Malita <fmalita@google.com>
4 files changed