Bump the actions group with 2 updates

Bumps the actions group with 2 updates: [actions/upload-artifact](https://github.com/actions/upload-artifact) and [actions/download-artifact](https://github.com/actions/download-artifact).


Updates `actions/upload-artifact` from 4 to 5
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v5)

Updates `actions/download-artifact` from 5 to 6
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: actions/download-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

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

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Run Unit Tests
         run: pytest --junit-xml=test-results-${{matrix.os}}-${{matrix.python-version}}.junit.xml
       - name: Upload Test Results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         if: always()
         with:
           if-no-files-found: error
@@ -62,7 +62,7 @@ jobs:
       - name: Run Unit Tests
         run: /usr/local/icetray/env-shell.sh python -m pytest --junit-xml=test-results-icetray.junit.xml
       - name: Upload Test Results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         if: always()
         with:
           if-no-files-found: error
@@ -79,7 +79,7 @@ jobs:
     if: always()
     steps:
       - name: Download Artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           path: .
           pattern: test-results-*