Remove Swift 6.0 from CI matrix, keeping only Swift 6.1 (#879)

Author: meatball133

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-15]
-        swift: ["6.0", "6.1"]
+        swift: ["6.1"]
     env:
       RUNALL: "true"
     steps: