Bump actions/download-artifact from 6 to 7

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/part_docs.yml

@@ -53,7 +53,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
-      - uses: actions/download-artifact@v6
+      - uses: actions/download-artifact@v7
         with:
           name: docs
           path: docs

.github/workflows/part_publish.yml

@@ -87,7 +87,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
-      - uses: actions/download-artifact@v6
+      - uses: actions/download-artifact@v7
         with:
           name: package
           path: .