chore(deps): update actions/checkout action to v4 (#18)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/continuous-integration.yml

@@ -14,6 +14,6 @@ jobs:
       - name: Download Earthly v0.8.6.
         run: "sudo /bin/sh -c 'wget https://github.com/earthly/earthly/releases/download/v0.8.6/earthly-linux-amd64 -O /usr/local/bin/earthly && chmod +x /usr/local/bin/earthly'"
       - name: Checkout code.
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Compile.
         run: earthly --ci +compile

.github/workflows/conventional-commits.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Download Earthly v0.8.6.
         run: "sudo /bin/sh -c 'wget https://github.com/earthly/earthly/releases/download/v0.8.6/earthly-linux-amd64 -O /usr/local/bin/earthly && chmod +x /usr/local/bin/earthly'"
       - name: Checkout code.
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0

.github/workflows/git-history.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Download Earthly v0.8.6.
         run: "sudo /bin/sh -c 'wget https://github.com/earthly/earthly/releases/download/v0.8.6/earthly-linux-amd64 -O /usr/local/bin/earthly && chmod +x /usr/local/bin/earthly'"
       - name: Checkout code.
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0

.github/workflows/github-actions-workflows.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Download Earthly v0.8.6.
         run: "sudo /bin/sh -c 'wget https://github.com/earthly/earthly/releases/download/v0.8.6/earthly-linux-amd64 -O /usr/local/bin/earthly && chmod +x /usr/local/bin/earthly'"
       - name: Checkout code.
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Check GitHub Actions workflows linting.
         run: earthly +check-github-actions-workflows-linting
   formatting:
@@ -24,6 +24,6 @@ jobs:
       - name: Download Earthly v0.8.6.
         run: "sudo /bin/sh -c 'wget https://github.com/earthly/earthly/releases/download/v0.8.6/earthly-linux-amd64 -O /usr/local/bin/earthly && chmod +x /usr/local/bin/earthly'"
       - name: Checkout code.
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Check formatting.
         run: earthly +check-yaml-formatting