use swift tools 6.1

Author: fulldecent

.github/workflows/ci.yml

@@ -64,6 +64,10 @@ jobs:
           name: generated-project
           path: TestModule/
 
+      - uses: swift-actions/setup-swift@v2
+        with:
+          swift-version: "6.1.0"
+    
       - name: Test generated Swift package
         run: |
           cd TestModule