Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

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

.github/workflows/operator.yaml

@@ -107,7 +107,7 @@ jobs:
           make catalog-push
 
       - name: Save bundle
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: bundle
           path: bundle/

.github/workflows/tests.yaml

@@ -14,7 +14,7 @@ jobs:
         run: make bundle
       - name: Run scorecard tests
         run: operator-sdk scorecard ./bundle -o xunit > scorecard-tests.xml
-      - uses: actions/upload-artifact@v3  # upload test results
+      - uses: actions/upload-artifact@v4  # upload test results
         if: success() || failure()        # run this step even if previous step failed
         with:
           name: test-results