Update dart.yml

Author: socheatsok78

.github/workflows/dart.yml

@@ -22,7 +22,8 @@ jobs:
           - 3.0.0
           - 2.10.5
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+
       - uses: ./
         with:
           channel: stable
@@ -50,7 +51,8 @@ jobs:
           - 3.3.0-0.0.pre
           - 3.1.0
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+
       - uses: ./
         with:
           channel: beta