build(deps): bump dawidd6/action-download-artifact in /.github/workflows

Bumps [dawidd6/action-download-artifact](https://github.com/dawidd6/action-download-artifact) from 3 to 6.
- [Release notes](https://github.com/dawidd6/action-download-artifact/releases)
- [Commits](https://github.com/dawidd6/action-download-artifact/compare/v3...v6)

---
updated-dependencies:
- dependency-name: dawidd6/action-download-artifact
  dependency-type: direct:production
...

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

.github/workflows/test-llvm.yml

@@ -25,7 +25,7 @@ jobs:
       LLVM_VERSION: ${{steps.get-parameters.outputs.LLVM_VERSION}}
     steps:
       - name: Download build parameters
-        uses: dawidd6/action-download-artifact@v3
+        uses: dawidd6/action-download-artifact@v6
         with:
           workflow: build.yml
           workflow_conclusion: success
@@ -47,7 +47,7 @@ jobs:
         run: |
           choco install ninja
       - name: Download toolchain
-        uses: dawidd6/action-download-artifact@v3
+        uses: dawidd6/action-download-artifact@v6
         with:
           workflow: build.yml
           workflow_conclusion: success