Bump actions/download-artifact from 3 to 7

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...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/ch07-packaging.yml

@@ -138,7 +138,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v7
         with:
           name: artifact
           path: ./ch07/first-python-package/dist # Update to match root of package