Fix run_release_test flakiness (#45417)

dev/devicelab/manifest.yaml

diff --git a/dev/devicelab/manifest.yaml b/dev/devicelab/manifest.yaml
index 3f5cb55..a04ef00 100644
--- a/dev/devicelab/manifest.yaml
+++ b/dev/devicelab/manifest.yaml
@@ -220,6 +220,7 @@
       Checks that `flutter run --release` does not crash.
     stage: devicelab
     required_agent_capabilities: ["mac/android"]
+    flaky: true # https://github.com/flutter/flutter/issues/45416.
 
   platform_interaction_test:
     description: >