Bump actions/download-artifact from 2 to 3

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v2...v3)

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

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

.github/workflows/manage-prs.yml

@@ -144,7 +144,7 @@ jobs:
           location: ${{ runner.temp }}
 
       - name: Download diff
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v3
         with:
           path: ${{ needs.diff.outputs.path }}
           name: ${{ needs.diff.outputs.artifact }}
@@ -396,7 +396,7 @@ jobs:
     steps:
       - name: Check for existence of submission check failure flag artifact
         id: failure-flag-exists
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v3
         continue-on-error: true
         with:
           name: ${{ env.CHECK_SUBMISSIONS_FAIL_FLAG_ARTIFACT }}

.github/workflows/sync-labels.yml

@@ -108,7 +108,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Download configuration files artifact
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v3
         with:
           name: ${{ env.CONFIGURATIONS_ARTIFACT }}
           path: ${{ env.CONFIGURATIONS_FOLDER }}