Bump actions/checkout from 5 to 6 (#1096)

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/test.yml

@@ -13,7 +13,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Python with uv
         uses: astral-sh/setup-uv@v7
@@ -58,7 +58,7 @@ jobs:
               django-version: "main"
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Update repositories
       run: sudo apt-get update
@@ -107,7 +107,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [ tests_matrix ]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Python with uv
         uses: astral-sh/setup-uv@v7
@@ -126,7 +126,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [ tests_matrix ]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Python with uv
         uses: astral-sh/setup-uv@v7