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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
         with:
           access_token: ${{ secrets.GITHUB_TOKEN }}
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Determine next version
         uses: cycjimmy/semantic-release-action@v2
@@ -34,7 +34,7 @@ jobs:
     needs: determine-version
     if: ${{ needs.determine-version.outputs.version }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Login to DockerHub
         uses: docker/login-action@v1
@@ -57,7 +57,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: push-docker-image
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Create `.env` file
         uses: SpicyPizza/[email protected]