Drop Swift 5.7 support

Swift 5.7 doesn't support short-circuit evaluation in `#if` conditions

Author: kateinoigakukun

.github/workflows/test.yml

@@ -76,8 +76,6 @@ jobs:
     strategy:
       matrix:
         include:
-          - os: macos-12
-            xcode: Xcode_14.0
           - os: macos-13
             xcode: Xcode_14.3
           - os: macos-14