fix: ci, why doesn't it default to stable?

Author: techno-disaster

.github/workflows/create_artifacts.yml

@@ -17,6 +17,8 @@ jobs:
       uses: actions/checkout@v2.3.4
     - name: Install Flutter
       uses: subosito/flutter-action@v1.5.3
+      with:
+        channel: 'stable'
     - name: Flutter format
       run: |
         flutter format . --set-exit-if-changed
@@ -35,6 +37,8 @@ jobs:
       uses: actions/checkout@v2.3.4
     - name: Install Flutter
       uses: subosito/flutter-action@v1.5.3
+      with:
+        channel: 'stable'
     - name: Enable desktop support
       run: flutter config --enable-windows-desktop
     - name: Build Windows app
@@ -62,6 +66,8 @@ jobs:
         uses: actions/checkout@v2.3.4
       - name: Install Flutter
         uses: subosito/flutter-action@v1.5.3
+        with:
+          channel: 'stable'
       - name: Enable desktop support
         run: |
           flutter config --enable-linux-desktop

.github/workflows/create_releases.yml

@@ -13,6 +13,8 @@ jobs:
       uses: actions/checkout@v2.3.4
     - name: Install Flutter
       uses: subosito/flutter-action@v1.5.3
+      with:
+        channel: 'stable'
     - name: Enable desktop support
       run: flutter config --enable-windows-desktop
     - name: Build Windows app
@@ -41,6 +43,8 @@ jobs:
       uses: actions/checkout@v2.3.4
     - name: Install Flutter
       uses: subosito/flutter-action@v1.5.3
+      with:
+        channel: 'stable'
     - name: Enable desktop support
       run: |
         flutter config --enable-linux-desktop