Bump dart from `2a03228` to `f1e2b96` in /app_dart (#2488)

Bumps dart from `2a03228` to `f1e2b96`.

---
updated-dependencies:
- dependency-name: dart
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/app_dart/Dockerfile b/app_dart/Dockerfile
index e245cb6..3b2c245 100644
--- a/app_dart/Dockerfile
+++ b/app_dart/Dockerfile
@@ -4,7 +4,7 @@
 
 
 # Dart Docker official images can be found here: https://hub.docker.com/_/dart
-FROM dart:beta@sha256:2a0322886c3f2115a45c7b59f56e531a2c85bd5c6016ccf4e367f1c2e56dc4a9
+FROM dart:beta@sha256:f1e2b96d430f29dab6c332dc4502e24aac60d372ceefc4b84045a75cc0c2731b
 
 WORKDIR /app