Force the required(?) non-standard setup

Author: CTMacUser

.github/workflows/swift.yml

@@ -16,6 +16,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
+    - uses: swift-actions/setup-swift@v2
+      with:
+        swift-version: "6"
+    - name: Get swift version
+      run: swift --version
     - name: Build
       run: swift build -v
     - name: Run tests