Update Redis to CE Milestone 3 (redis#3)

Author: adobrzhansky

.github/workflows/unstable.yml

@@ -25,7 +25,7 @@ jobs:
       with:
         repository: redis/redis
         path: redis
-        ref: '8.0-m02'
+        ref: '8.0-m03'
 
     - name: Setup Snapcraft
       run: |