Roll new gallery version in the perf test (#56575)

dev/devicelab/lib/tasks/new_gallery.dart

@@ -19,7 +19,7 @@ class NewGalleryPerfTest extends PerfTest {
     // Manually roll the new gallery version for now. If the new gallery repo
     // turns out to be updated frequently in the future, we can set up an auto
     // roller to update this version.
-    await getNewGallery('59489e5571ddf554fc62ef52e9b16f1fed291026', galleryDir);
+    await getNewGallery('c1682ac4b35dc239f023eaf0238a98910b3a2d6c', galleryDir);
     return await super.run();
   }
 

dev/devicelab/manifest.yaml

@@ -775,12 +775,12 @@ tasks:
     stage: devicelab
     required_agent_capabilities: ["linux/android"]
 
-# TODO(https://github.com/flutter/flutter/issues/56135)
-#  new_gallery__transition_perf:
-#    description: >
-#      Measures the performance of screen transitions in the new Flutter Gallery on Android.
-#    stage: devicelab
-#    required_agent_capabilities: ["mac/android"]
+  new_gallery__transition_perf:
+    description: >
+      Measures the performance of screen transitions in the new Flutter Gallery on Android.
+    stage: devicelab
+    required_agent_capabilities: ["mac/android"]
+    flaky: true
 
   fast_scroll_large_images__memory:
     description: >