Bump collection from 1.16.0 to 1.17.0 in /app_dart (#2218)

diff --git a/app_dart/pubspec.lock b/app_dart/pubspec.lock
index 834c963..1f0855e 100644
--- a/app_dart/pubspec.lock
+++ b/app_dart/pubspec.lock
@@ -147,7 +147,7 @@
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.16.0"
+    version: "1.17.0"
   convert:
     dependency: transitive
     description:
diff --git a/app_dart/pubspec.yaml b/app_dart/pubspec.yaml
index 7b74999..df7e169 100644
--- a/app_dart/pubspec.yaml
+++ b/app_dart/pubspec.yaml
@@ -12,7 +12,7 @@
 
 dependencies:
   appengine: ^0.13.2
-  collection: ^1.16.0
+  collection: ^1.17.0
   corsac_jwt: ^1.0.0-nullsafety.1
   crypto: ^3.0.2
   dbcrypt: ^2.0.0