Bump actions/download-artifact from 4 to 6

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  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/main.yml

@@ -52,7 +52,7 @@ jobs:
     steps:
      # Checkout code
     - name: Download bicep
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v6
       with:
         name: bicep
         path: bicep
@@ -76,7 +76,7 @@ jobs:
         failOnStdErr: false
 
     - name: Download App
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v6
       with:
         name: app  
         path: app