updated flutter actions

Author: jerson

.github/workflows/hover.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v1
-      - uses: subosito/flutter-action@v2
+      - uses: subosito/flutter-action@main
         with:
           channel: 'dev'
       - uses: actions/setup-go@v2

.github/workflows/tests_android.yml

@@ -29,7 +29,7 @@ jobs:
         with:
           java-version: 1.8
       - uses: android-actions/setup-android@v2
-      - uses: subosito/flutter-action@v2
+      - uses: subosito/flutter-action@main
         with:
           channel: 'dev'
       - run: flutter pub get

.github/workflows/tests_browser.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v1
-      - uses: subosito/flutter-action@v2
+      - uses: subosito/flutter-action@main
         with:
           channel: 'dev'
       - uses: nanasess/setup-chromedriver@master

.github/workflows/tests_ios.yml

@@ -15,7 +15,7 @@ jobs:
         with:
           model: "iPhone 12 mini"
       - uses: actions/checkout@v1
-      - uses: subosito/flutter-action@v2
+      - uses: subosito/flutter-action@main
         with:
           channel: 'dev'
       - name: install deps

.github/workflows/tests_linux.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v1
-      - uses: subosito/flutter-action@v2
+      - uses: subosito/flutter-action@main
         with:
           channel: 'dev'
       - run: sudo apt-get update && sudo apt-get install clang cmake ninja-build pkg-config libgtk-3-dev

.github/workflows/tests_macos.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: macos-11
     steps:
       - uses: actions/checkout@v1
-      - uses: subosito/flutter-action@v2
+      - uses: subosito/flutter-action@main
         with:
           channel: 'dev'
       - name: install deps

.github/workflows/tests_windows.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: windows-2019
     steps:
       - uses: actions/checkout@v1
-      - uses: subosito/flutter-action@v2
+      - uses: subosito/flutter-action@main
         with:
           channel: 'dev'
       - name: install deps