Bump dart from `663f027` to `288dfb3` in /app_dart (#2382)

Bumps dart from `663f027` to `288dfb3`.

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

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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 8ca5bd0..8290a10 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@sha256:663f027e7da3c8609b10e953556fb1d79d9fd596530bf96a3a4f9a5cc9484e07
+FROM dart:beta@sha256:288dfb322423f4e8d42e2490cf0a3c2a5d802ed3defeb2750509d05f7213b330
 
 WORKDIR /app