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

Author: renovate[bot]

.github/workflows/actionlint.yaml

@@ -38,7 +38,7 @@ jobs:
     name: actionlint with reviewdog
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: actionlint
         uses: reviewdog/action-actionlint@v1
         with:

.github/workflows/ci.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup Rust toolchain
         uses: actions-rs/toolchain@v1
@@ -59,7 +59,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Docker Buildx
         id: buildx