Remove ali.png which doesn't exist (#112506)

dev/benchmarks/microbenchmarks/pubspec.yaml

diff --git a/dev/benchmarks/microbenchmarks/pubspec.yaml b/dev/benchmarks/microbenchmarks/pubspec.yaml
index abfcef2..f07828f 100644
--- a/dev/benchmarks/microbenchmarks/pubspec.yaml
+++ b/dev/benchmarks/microbenchmarks/pubspec.yaml
@@ -129,7 +129,6 @@
     - packages/flutter_gallery_assets/products/table.png
     - packages/flutter_gallery_assets/products/teaset.png
     - packages/flutter_gallery_assets/products/top.png
-    - packages/flutter_gallery_assets/people/ali.png
     - packages/flutter_gallery_assets/people/square/ali.png
     - packages/flutter_gallery_assets/people/square/peter.png
     - packages/flutter_gallery_assets/people/square/sandra.png