Add 3.7 to workflow as a supported major version (#81)

Author: mateusfccp

.github/workflows/ci.yaml

@@ -15,7 +15,7 @@ jobs:
 
     strategy:
       matrix:
-        dart_version: ["3.0", "3.1", "3.2", "3.3", "3.4", "3.5", "3.6"]
+        dart_version: ["3.0", "3.1", "3.2", "3.3", "3.4", "3.5", "3.6", "3.7"]
 
     runs-on: ubuntu-latest