ci: add matrix

Author: KazuCocoa

.github/workflows/dart.yml

@@ -11,8 +11,9 @@ jobs:
 
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        sdk: [2.19, 3.1, 3.2, 3.3, 3.4, beta]
+        sdk: [2.19, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, beta]
 
     steps:
     - uses: actions/checkout@v4