Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v4.1.7)

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

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

.github/workflows/cpu-packages.yml

@@ -134,7 +134,7 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4.1.7
         with:
           name: conda-${{ matrix.python-version }}
           path: conda
@@ -158,7 +158,7 @@ jobs:
     if: "startsWith(github.ref, 'refs/tags/')"
     needs: [build-pypi]
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4.1.7
         with:
           name: dist
           path: dist

.github/workflows/docs-sched-rebuild.yaml

@@ -58,7 +58,7 @@ jobs:
           git config user.name docs-sched-rebuild
           git config user.email [email protected]
       - name: Download artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: html-build-artifact
       - name: Copy HTML directories