ci(deps): bump actions/checkout from 5 to 6

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>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
     name: Lint & Format check
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -52,7 +52,7 @@ jobs:
     name: Type check
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -78,7 +78,7 @@ jobs:
     name: Security Check
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -145,7 +145,7 @@ jobs:
     name: Unit tests Python ${{ matrix.python-version }} on ${{ matrix.os }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -208,7 +208,7 @@ jobs:
     name: Integration Tests on Python 3.13 and ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -255,7 +255,7 @@ jobs:
     if: always() && needs.unit-tests.result == 'success'
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Download coverage from Python 3.13
         uses: actions/download-artifact@v6
@@ -284,7 +284,7 @@ jobs:
     needs: [lint, type-check]
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Install uv
       uses: astral-sh/setup-uv@v7

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
       actions: read # For checkout action
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -70,7 +70,7 @@ jobs:
   #     url: https://pypi.org/p/smppai
   #   steps:
   #     - name: Checkout repository
-  #       uses: actions/checkout@v5
+  #       uses: actions/checkout@v6
   #       with:
   #         ref: main
 

.github/workflows/validate-commits.yml

@@ -10,7 +10,7 @@ jobs:
     name: Validate Conventional Commits
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0