Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows (#6533)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v3...v4.1.7)

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

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

.github/workflows/nightly_build.yml

@@ -320,7 +320,7 @@ jobs:
           ref: unstable
 
       - name: Download artefacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
 
       - name: Create release notes
         run: |

.github/workflows/release.yml

@@ -349,7 +349,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Download artefacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
       - name: Create release notes
         run: |
           cat > release_notes.md <<EOF