chore: Update flutter

.gitlab-ci.yml

@@ -1,5 +1,5 @@
 image:
-  name: cirrusci/flutter:2.2.3
+  name: cirrusci/flutter
 
 variables:
   GIT_SUBMODULE_STRATEGY: recursive

pubspec.lock

@@ -56,7 +56,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.6.1"
+    version: "2.8.1"
   audioplayers:
     dependency: "direct main"
     description:
@@ -119,7 +119,7 @@ packages:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.1"
   chewie:
     dependency: "direct main"
     description:
@@ -515,6 +515,13 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.2"
   future_loading_dialog:
     dependency: "direct main"
     description:
@@ -745,7 +752,7 @@ packages:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "1.7.0"
   mgrs_dart:
     dependency: transitive
     description:
@@ -1312,21 +1319,21 @@ packages:
       name: test
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.16.8"
+    version: "1.17.10"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.0"
+    version: "0.4.2"
   test_core:
     dependency: transitive
     description:
       name: test_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.19"
+    version: "0.4.0"
   timezone:
     dependency: transitive
     description: