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](actions/download-artifact@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>

Author: dependabot[bot]

.github/workflows/benchmark-visualization.yml

@@ -49,7 +49,7 @@ jobs:
       - name: Checkout main branch
         uses: actions/checkout@v5
       - name: Download latest benchmark result
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: benchmark-result-artifact
           path: ${{github.workspace}}
@@ -87,7 +87,7 @@ jobs:
         run: mkdir ${{github.workspace}}/current
 
       - name: Download latest benchmark visualization files
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: benchmark-gh-pages-artifact
           path: ${{github.workspace}}/current

.github/workflows/releases.yml

@@ -79,7 +79,7 @@ jobs:
         os: ${{ fromJSON(needs.setup.outputs.available-runners) }}
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           name: artifacts-${{ matrix.os }}
           path: release/
@@ -91,7 +91,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           path: assets/
           pattern: artifacts-*