Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/checks.yml

@@ -7,7 +7,7 @@ jobs:
     name: "terraform"
     runs-on: "ubuntu-latest"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Terraform
         uses: hashicorp/setup-terraform@v3
       - name: Cache terraform folder
@@ -25,7 +25,7 @@ jobs:
     name: "tflint"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/cache@v4
         name: Cache tflint plugin dir
         with:
@@ -41,7 +41,7 @@ jobs:
     name: "tfsec"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Run tfsec with reviewdog output on the PR
         uses: reviewdog/action-tfsec@master
         with:

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
     if: github.ref == 'refs/heads/main'
     environment: prod
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: gh cli auth
         run: echo "${{ secrets.GITHUB_TOKEN }}" | gh auth login --with-token