Bump actions/upload-artifact from 5 to 6 (#177)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/refresh-lockfiles.yml

@@ -50,7 +50,7 @@ jobs:
           pipx run conda-lock -k explicit -p linux-64 -f requirements/${{matrix.python}}.yml
           mv conda-linux-64.lock ${{matrix.python}}-linux-64.lock
       - name: output lockfile
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: lock-artifacts-${{matrix.python}}
           path: ${{matrix.python}}-linux-64.lock