Bump actions/download-artifact from 3 to 4

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v3...v4)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/10-dotnet.yml

@@ -68,7 +68,7 @@ jobs:
     steps:
       # Checkout code
       - name: Download IaC
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: iac
           path: iac
@@ -92,7 +92,7 @@ jobs:
           failOnStdErr: false
 
       - name: Download App
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: webapp
           path: webapp