revert version

Author: t089

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         os: [macos-latest, ubuntu-latest]
         swift-version:
           - 6.0.3
-          - 6.1.2
+          - 6.1.0
 
     runs-on: ${{ matrix.os }}
     name: Test (${{ matrix.os }}, Swift ${{ matrix.swift-version }})