build(deps): bump actions/upload-artifact from 5 to 6

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

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

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

Author: dependabot[bot]

.github/workflows/ci-tests.yml

@@ -214,7 +214,7 @@ jobs:
           CWLTOOL_OPTIONS: ${{ matrix.cwl-version == 'v1.2' && '--relax-path-checks' || '' }} ${{ matrix.extras }}
         run: ./conformance-test.sh
       - name: Archive test results
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: cwl-${{ matrix.cwl-version }}-${{ matrix.container }}${{ matrix.extras }}-conformance-results
           path: |

.github/workflows/wheels.yml

@@ -54,7 +54,7 @@ jobs:
           # Linux arm64 wheels are built on circleci
           CIBW_ARCHS_LINUX: auto64 # ppc64le s390x
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: artifact-${{ matrix.image }}
           path: ./wheelhouse/*.whl
@@ -76,7 +76,7 @@ jobs:
       - name: Build sdist
         run: pipx run build --sdist
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: artifact-source
           path: dist/*.tar.gz
@@ -102,7 +102,7 @@ jobs:
       - name: Build wheels
         uses: pypa/cibuildwheel@v3.3
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: artifact-${{ matrix.os }}-${{ strategy.job-index }}
           path: ./wheelhouse/*.whl