Add host 5.7 toolchain matrix entry

Author: kateinoigakukun

.github/workflows/swift.yml

@@ -11,6 +11,9 @@ jobs:
     strategy:
       matrix:
         include:
+          - os: macos-12
+            swift_version: 5.7
+            xcode: /Applications/Xcode_14.0.app/Contents/Developer
           - os: macos-12
             swift_version: 5.6
             xcode: /Applications/Xcode_13.4.app/Contents/Developer
@@ -19,6 +22,8 @@ jobs:
             xcode: /Applications/Xcode_13.2.1.app/Contents/Developer
           - os: ubuntu-20.04
             swift_version: 5.6
+          - os: ubuntu-20.04
+            swift_version: 5.7
     name: Build on ${{ matrix.os }} with Swift ${{ matrix.swift_version }}
     timeout-minutes: 40
     runs-on: ${{ matrix.os }}