Update flutter version for testing

Author: socheatsok78

.github/workflows/dart.yml

@@ -16,7 +16,10 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        version: [3.0.2, 3.0.1, 3.0.0, 2.10.5]
+        version: 
+          - 3.3.0
+          - 3.0.0
+          - 2.10.5
     steps:
       - uses: actions/checkout@v2
       - uses: ./
@@ -42,7 +45,9 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        version: [3.1.0, 3.1.0-9.0.pre]
+        version: 
+          - 3.3.0-0.0.pre
+          - 3.1.0
     steps:
       - uses: actions/checkout@v2
       - uses: ./