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.yaml

@@ -164,7 +164,7 @@ jobs:
         id: create_artifacts
         if: always()
         run: echo "step is actually running" && python3 ci/create-artifacts.py
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: always() && steps.create_artifacts.outcome == 'success'
         with:
           name: ${{ env.ARCHIVE_NAME }}-${{ matrix.target }}${{ matrix.artifact-tag && format('-{0}', matrix.artifact-tag) }}
@@ -260,7 +260,7 @@ jobs:
         id: create_artifacts
         if: always()
         run: ./ci/create-artifacts.py
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: always() && steps.create_artifacts.outcome == 'success'
         with:
           name: ${{ env.ARCHIVE_NAME }}-${{ matrix.target }}${{ matrix.artifact-tag && format('-{0}', matrix.artifact-tag) }}