ci: bump actions/download-artifact from 5 to 6

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v5...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>

.github/workflows/draft.yml

@@ -173,7 +173,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [build-snap]
     steps:
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           pattern: snap-*
           merge-multiple: true
@@ -202,7 +202,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [build-unix, build-windows, build-musl, build-snap]
     steps:
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           merge-multiple: true
 
@@ -231,7 +231,7 @@ jobs:
 
       - uses: actions/checkout@v5
 
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           merge-multiple: true
 

.github/workflows/publish.yml

@@ -8,7 +8,7 @@ jobs:
   winget:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           merge-multiple: true