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

Bumps [dawidd6/action-download-artifact](https://github.com/dawidd6/action-download-artifact) from 2 to 6.
- [Release notes](https://github.com/dawidd6/action-download-artifact/releases)
- [Commits](dawidd6/action-download-artifact@v2...v6)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/publish-artifacts.yml

@@ -42,20 +42,20 @@ jobs:
       # Not the default gh download-artifact action, which doesn't work
       # between workflows
       - name: Get previous artifact learn-ocaml-www
-        uses: dawidd6/action-download-artifact@v2
+        uses: dawidd6/action-download-artifact@v6
         with:
           workflow: ${{ github.event.workflow_run.workflow_id }}
           name: learn-ocaml-www
           path: artifacts/
           skip_unpack: true
       - name: Get previous artifact learn-ocaml-linux-x86_64
-        uses: dawidd6/action-download-artifact@v2
+        uses: dawidd6/action-download-artifact@v6
         with:
           workflow: ${{ github.event.workflow_run.workflow_id }}
           name: learn-ocaml-linux-x86_64
           path: artifacts/linux-x86_64
       - name: Get previous artifact learn-ocaml-darwin-x86_64
-        uses: dawidd6/action-download-artifact@v2
+        uses: dawidd6/action-download-artifact@v6
         with:
           workflow: ${{ github.event.workflow_run.workflow_id }}
           name: learn-ocaml-darwin-x86_64

.github/workflows/release.yml

@@ -46,7 +46,7 @@ jobs:
         uses: actions/checkout@v4
       - name: Download workflow artifacts
         # cf. https://github.com/actions/download-artifact/issues/3
-        uses: dawidd6/action-download-artifact@v2
+        uses: dawidd6/action-download-artifact@v6
         with:
           workflow: static-builds.yml
           workflow_conclusion: success