build(deps): bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/checkov.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         name: Checkout source code
 
       - name: Run Checkov action

.github/workflows/documentation.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         name: Checkout source code
 
       - name: Run Terraform-Docs

.github/workflows/formatting.yml

@@ -13,7 +13,7 @@ jobs:
         engine: ["opentofu", "terraform"]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install Terraform
         uses: hashicorp/setup-terraform@v3

.github/workflows/terraform_tests.yml

@@ -24,7 +24,7 @@ jobs:
     continue-on-error: ${{ matrix.experimental }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install Terraform
         uses: hashicorp/setup-terraform@v3

.github/workflows/terratest.yml

@@ -24,7 +24,7 @@ jobs:
     continue-on-error: ${{ matrix.experimental }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install Terraform
         uses: hashicorp/setup-terraform@v3

.github/workflows/tflint.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         name: Checkout source code
 
       - uses: terraform-linters/setup-tflint@v3

.github/workflows/trivy.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         name: Checkout source code
 
       - name: Trivy

.github/workflows/validation.yml

@@ -22,7 +22,7 @@ jobs:
     continue-on-error: ${{ matrix.experimental }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install Terraform
         uses: hashicorp/setup-terraform@v3