Bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  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

@@ -11,7 +11,7 @@ jobs:
         name: Build Frontend
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
             - uses: actions/setup-node@v4
               with:
                 node-version: 24
@@ -27,7 +27,7 @@ jobs:
         needs: build-frontend
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
             - uses: actions/download-artifact@v5
               with:
                   name: workspace
@@ -79,7 +79,7 @@ jobs:
 
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
             - uses: actions/download-artifact@v5
               with:
                 name: workspace
@@ -103,7 +103,7 @@ jobs:
         needs: [test-frontend, test-backend]
         if: github.actor == 'dependabot[bot]'
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
             - name: Enable auto-merge
               run: gh pr merge --auto --merge "$PR_URL"
               env:
@@ -123,7 +123,7 @@ jobs:
             contents: write
             id-token: write
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
             - name: Install Hatch
               run: pip install hatch
             - uses: actions/download-artifact@v5