[fuchsia] Fix package/flutter BUILD.gn deps (#15951)

packages/flutter/BUILD.gn

diff --git a/packages/flutter/BUILD.gn b/packages/flutter/BUILD.gn
index 630a3ba..6bbb0f3 100644
--- a/packages/flutter/BUILD.gn
+++ b/packages/flutter/BUILD.gn
@@ -17,6 +17,7 @@
     "//third_party/dart-pkg/pub/async",
     "//third_party/dart-pkg/pub/collection",
     "//third_party/dart-pkg/pub/meta",
+    "//third_party/dart-pkg/pub/typed_data",
     "//third_party/dart-pkg/pub/vector_math",
   ]