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]>

Author: dependabot[bot]

.github/workflows/ci-tests.yml

@@ -207,7 +207,7 @@ jobs:
           CWLTOOL_OPTIONS: ${{ matrix.cwl-version == 'v1.2' && '--relax-path-checks' || '' }} ${{ matrix.extras }}
         run: ./conformance-test.sh
       - name: Archive test results
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: cwl-${{ matrix.cwl-version }}-${{ matrix.container }}${{ matrix.extras }}-conformance-results
           path: |