chore(deps): 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/llvm-build-bump-pr.yml

@@ -461,19 +461,19 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Download artifacts for clang-format-git
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           path: packages/clang-format-git/bin
           pattern: cfg-*
 
       - name: Download artifacts for clang-format-git-python
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           path: packages/clang-format-git-python/script
           name: git-clang-format
 
       - name: Download artifacts for clang-format-node
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           path: packages/clang-format-node/bin
           pattern: cfn-*

.github/workflows/test-cross-platform.yml

@@ -83,7 +83,7 @@ jobs:
           node-version: ${{ matrix.node-version }}
 
       - name: Download artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           path: .