Upgrade actions/checkout to v4

Author: shepmaster

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
       IMAGE_NAME: ghcr.io/integer32llc/rust-playground-ci-rust-${{ matrix.channel }}
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: "${{ github.event.pull_request.head.sha }}"
     - name: Set up Docker Buildx
@@ -56,7 +56,7 @@ jobs:
     if: 'github.event_name == ''push'' || contains(github.event.pull_request.labels.*.name, ''CI: approved'')'
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: "${{ github.event.pull_request.head.sha }}"
     - name: Install Rust
@@ -85,7 +85,7 @@ jobs:
     if: 'github.event_name == ''push'' || contains(github.event.pull_request.labels.*.name, ''CI: approved'')'
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: "${{ github.event.pull_request.head.sha }}"
     - name: Configure node
@@ -140,7 +140,7 @@ jobs:
         working-directory: tests
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: "${{ github.event.pull_request.head.sha }}"
     - name: Configure Ruby

.github/workflows/cron.yml

@@ -25,7 +25,7 @@ jobs:
     continue-on-error: true
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v2
       with:

ci/workflows.yml

@@ -7,13 +7,13 @@ components:
 
   - checkout: &checkout
       name: "Checkout code"
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
   # This should only be used when we know that the code being tested
   # doesn't make use of our secrets or elevated GitHub token.
   - checkout_pr: &checkout_pr
       name: "Checkout code"
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: ${{ github.event.pull_request.head.sha }}