Bump actions/checkout from 5 to 6 (#101)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/codeql.yml

@@ -25,7 +25,7 @@ jobs:
       matrix:
         language: ["python", "actions"]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v4
         with:

.github/workflows/terraform.yml

@@ -31,7 +31,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup TFLint
         uses: terraform-linters/setup-tflint@v6
         with:
@@ -62,7 +62,7 @@ jobs:
       TF_VAR_lambda_package_path: ${{ github.workspace}}/${{ vars.LAMBDA_PACKAGE }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: "3.14"