Update actions/checkout action to v4.3.1

Author: renovate[bot]

.github/workflows/ci-linux.yml

@@ -17,7 +17,7 @@ jobs:
       image: swift:${{ matrix.swift }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.2.1
+        uses: actions/checkout@v4.3.1
 
       - name: APT cache
         uses: actions/[email protected]

.github/workflows/ci-macos.yml

@@ -15,7 +15,7 @@ jobs:
         xcode: ["15.4", "16.0"]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.2.1
+        uses: actions/checkout@v4.3.1
 
       - 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@v4.2.1
+        uses: actions/checkout@v4.3.1
 
       - name: Cache vcpkg
         uses: actions/[email protected]