Update actions/checkout action to v3.6.0

Author: renovate[bot]

.github/workflows/ci-linux.yml

@@ -17,7 +17,7 @@ jobs:
       image: swift:${{ matrix.swift }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.5.2
+        uses: actions/checkout@v3.6.0
 
       - name: APT cache
         uses: actions/cache@v3

.github/workflows/ci-macos.yml

@@ -15,7 +15,7 @@ jobs:
         xcode: ["14.2"]
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.5.2
+        uses: actions/checkout@v3.6.0
 
       - name: Select Xcode ${{ matrix.xcode }}
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app

.github/workflows/markdown-link-check.yml

@@ -12,6 +12,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v3.5.2
+      uses: actions/checkout@v3.6.0
     - name: markdown-link-check
       uses: gaurav-nelson/[email protected]