GHA: Use Xcode latest/checkout 4

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Author: helje5

.github/workflows/swift.yml

@@ -31,9 +31,9 @@ jobs:
       - name: Select latest available Xcode
         uses: maxim-lobanov/[email protected]
         with:
-          xcode-version: 16.0.0
+          xcode-version: latest
       - name: Checkout Repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Build Swift Debug Package
         run: swift build -c debug
       - name: Build Swift Release Package