Revert "6e03bbd42 Roll Dart SDK from 4882a5e99192 to 93ff88f22f01 (2 revisions) (flutter/engine#26679) (#84342)"

This reverts commit 07921b561d6f79a5cfe0401b1b081a5d581bd771.
diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index 6f2d5c7..0939d2d 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-6e03bbd42cc12f22395e668924fd5de83b1089ab
+ab2955e7e5ae671577287bb18ae3bfda63db22d3