Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/ci-linux.yml

@@ -17,7 +17,7 @@ jobs:
       image: swift:${{ matrix.swift }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Test
         run: swift test -c release --enable-xctest --parallel --xunit-output .build/xUnit-output.xml

.github/workflows/ci-macos.yml

@@ -15,7 +15,7 @@ jobs:
         xcode: ["14.3.1", "15.4", "16.0"]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Select Xcode ${{ matrix.xcode }}
         run: sudo xcode-select -s '/Applications/Xcode_${{ matrix.xcode }}.app'

.github/workflows/ci-windows.yml

@@ -18,7 +18,7 @@ jobs:
           tag: 5.10-RELEASE
 
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Test
         run: swift test -c release --parallel --xunit-output .build/xUnit-output.xml