Bump actions/download-artifact

Bumps the github_actions group with 1 update in the /.github/workflows directory: [actions/download-artifact](https://github.com/actions/download-artifact).


Updates `actions/download-artifact` from 2 to 4
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v4)

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

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

.github/workflows/codeql_unit_tests.yml

@@ -164,7 +164,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Collect test results
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
 
       - name: Validate test results
         run: |

.github/workflows/standard_library_upgrade_tests.yml

@@ -162,7 +162,7 @@ jobs:
           python-version: "3.9"
 
       - name: Collect test results
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
 
       - name: Validate test results
         shell: python