Revert "Ugrade Flutter to 2.8.1"

This reverts commit 45a4c4d.

Flutter 2.8.1 caused an issue on iOS when closing the app. This will probably be hotfixed, so for now we'll stick to 2.6.x

.github/workflows/build.yaml

@@ -15,7 +15,8 @@ jobs:
       - name: Setup Flutter
         uses: subosito/flutter-action@v1
         with:
-          flutter-version: 2.8.1
+          flutter-version: '2.6.x'
+          channel: 'beta'
 
       - name: Pods cache
         uses: actions/cache@v2
@@ -95,7 +96,8 @@ jobs:
       - name: Setup Flutter
         uses: subosito/flutter-action@v1
         with:
-          flutter-version: 2.8.1
+          flutter-version: '2.6.x'
+          channel: 'beta'
 
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1

.github/workflows/codestyle.yaml

@@ -15,7 +15,8 @@ jobs:
       - name: Setup Flutter
         uses: subosito/flutter-action@v1
         with:
-          flutter-version: 2.8.1
+          flutter-version: '2.6.x'
+          channel: 'beta'
 
       - name: Formatting
         run: flutter format --set-exit-if-changed .
@@ -30,7 +31,8 @@ jobs:
       - name: Setup Flutter
         uses: subosito/flutter-action@v1
         with:
-          flutter-version: 2.8.1
+          flutter-version: '2.6.x'
+          channel: 'beta'
 
       - name: Analyze
         run: flutter analyze

.github/workflows/deploy.yaml

@@ -17,7 +17,8 @@ jobs:
       - name: Setup Flutter
         uses: subosito/flutter-action@v1
         with:
-          flutter-version: 2.8.1
+          flutter-version: '2.6.x'
+          channel: 'beta'
 
       - name: Pods cache
         uses: actions/cache@v2
@@ -91,7 +92,9 @@ jobs:
       - name: Setup Flutter
         uses: subosito/flutter-action@v1
         with:
-          flutter-version: 2.8.1
+          flutter-version: '2.6.x'
+          channel: 'beta'
+
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:

pubspec.lock

@@ -42,7 +42,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.8.2"
+    version: "2.8.1"
   bloc:
     dependency: transitive
     description:
@@ -147,7 +147,7 @@ packages:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.1.0"
   charcode:
     dependency: transitive
     description:
@@ -526,7 +526,7 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.11"
+    version: "0.12.10"
   meta:
     dependency: "direct main"
     description:
@@ -944,7 +944,7 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.3"
+    version: "0.4.2"
   timing:
     dependency: transitive
     description:
@@ -1021,7 +1021,7 @@ packages:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.1"
+    version: "2.1.0"
   watcher:
     dependency: transitive
     description:
@@ -1065,5 +1065,5 @@ packages:
     source: hosted
     version: "3.1.0"
 sdks:
-  dart: ">=2.15.0 <3.0.0"
+  dart: ">=2.14.0 <3.0.0"
   flutter: ">=2.5.0"

pubspec.yaml

@@ -17,7 +17,7 @@ publish_to: 'none'
 version: 3.0.1+1
 
 environment:
-  sdk: '>=2.15.0 <3.0.0'
+  sdk: '>=2.14.0 <3.0.0'
 
 dependencies:
   flutter: