Bump actions/download-artifact from 4 to 5

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 5.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  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

@@ -28,7 +28,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - uses: actions/checkout@v4
-            - uses: actions/download-artifact@v4
+            - uses: actions/download-artifact@v5
               with:
                   name: workspace
                   path: .
@@ -80,7 +80,7 @@ jobs:
 
         steps:
             - uses: actions/checkout@v4
-            - uses: actions/download-artifact@v4
+            - uses: actions/download-artifact@v5
               with:
                 name: workspace
                 path: .
@@ -126,7 +126,7 @@ jobs:
             - uses: actions/checkout@v4
             - name: Install Hatch
               run: pip install hatch
-            - uses: actions/download-artifact@v4
+            - uses: actions/download-artifact@v5
               with:
                   name: workspace
                   path: .