2857531 Bump Robolectric to 4.8.1 (flutter/engine#33024)

engine-flutter-autoroll · engine-flutter-autoroll · commit bf41be272288 · 2022-06-24T18:05:29.000Z
diff --git a/bin/internal/engine.version b/bin/internal/engine.version
@@ -1 +1 @@
-763997c83e8233b9d0ff73e03bb8f2fc93310659
+28575318be4cfa1bb01279ac2702d0aa5d3e765b
