Update set of Xcode versions

.github/workflows/main.yml

@@ -7,22 +7,6 @@ on:
     branches: [ main ]
 
 jobs:
-  Test-package-macos-12:
-    name: "Test Package"
-    runs-on: macos-12
-    strategy:
-      fail-fast: false
-      matrix:
-        xcode:
-        - '13.4.1' # Swift 5.6
-    steps:
-      - uses: actions/checkout@v2
-      - uses: ./.github/actions/setup
-        with:
-          xcode: ${{ matrix.xcode }}
-      - name: Build Package
-        run: bundle exec rake test:package:all
-
   Test-package-macos-13:
     name: "Test Package"
     runs-on: macos-13
@@ -33,6 +17,8 @@ jobs:
         - '14.2' # Swift 5.7
         - '14.3' # Swift 5.8
         - '15.0' # Swift 5.9
+        - '15.1' # Swift 5.9.2
+        - '15.2' # Swift 5.9.2 (first version with visionOS support, TODO: also test visionOS build)
     steps:
       - uses: actions/checkout@v2
       - uses: ./.github/actions/setup