Update CI workflow configuration

Author: mgutski

.github/workflows/ci.yml

@@ -26,11 +26,11 @@ jobs:
     name: Lint
     runs-on: macos-13
     env:
-      DEVELOPER_DIR: "/Applications/Xcode_14.3.app/Contents/Developer"
+      DEVELOPER_DIR: "/Applications/Xcode_15.0.app/Contents/Developer"
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install swift-format
         run: brew install swift-format
@@ -56,7 +56,7 @@ jobs:
         run: system_profiler SPHardwareDataType SPSoftwareDataType SPDeveloperToolsDataType
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Run Tests
         run: make tests