Bump actions/download-artifact from 2 to 5

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 5.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v5)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/pd-externals.yml

@@ -93,17 +93,17 @@ jobs:
       - name: Clone Git repository
         uses: actions/checkout@v2
       - name: Retrieve Linux externals
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v5
         with:
           name: linux-externals
           path: apf_example
       - name: Retrieve macOS external
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v5
         with:
           name: macos-externals
           path: apf_example
       - name: Retrieve Windows external
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v5
         with:
           name: windows-externals
           path: apf_example