Bump actions/download-artifact from 5.0.0 to 6.0.0 (#1400)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v5.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -99,7 +99,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v5
       - name: Download artifact
-        uses: actions/download-artifact@v5.0.0
+        uses: actions/download-artifact@v6.0.0
         with:
           # Artifact name
           name: docs_output # optional

.github/workflows/wheels.yml

@@ -117,7 +117,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v5
       - name: Download sdist
-        uses: actions/download-artifact@v5.0.0
+        uses: actions/download-artifact@v6.0.0
         with:
           name: sdist
       - name: Set up Python
@@ -159,7 +159,7 @@ jobs:
         with:
           access_token: ${{ secrets.GITHUB_TOKEN }}
       - name: Download sdist
-        uses: actions/download-artifact@v5.0.0
+        uses: actions/download-artifact@v6.0.0
         with:
           name: linux-wheels
       - uses: actions/setup-python@v6
@@ -188,7 +188,7 @@ jobs:
         with:
           access_token: ${{ secrets.GITHUB_TOKEN }}
       - name: Download sdist
-        uses: actions/download-artifact@v5.0.0
+        uses: actions/download-artifact@v6.0.0
         with:
           name: ${{ matrix.os }}-wheels
       - uses: actions/setup-python@v6
@@ -213,7 +213,7 @@ jobs:
         with:
           access_token: ${{ secrets.GITHUB_TOKEN }}
       - name: Download all
-        uses: actions/download-artifact@v5.0.0
+        uses: actions/download-artifact@v6.0.0
       - name: Move to dist
         run: |
           mkdir dist