Roll Gallery (required by the latest engine update and Dart SDK) (flutter#76409)

Author: jason-simmons

dev/devicelab/lib/versions/gallery.dart

@@ -3,4 +3,4 @@
 // found in the LICENSE file.
 
 /// The pinned version of flutter gallery, used for devicelab tests.
-const String galleryVersion = '8542ca8beebc8e989adee160f7f1f0841a734db2';
+const String galleryVersion = 'e2cfe22e9fa0b585b719cd911439fc80a3c27f39';