build(deps): bump actions/upload-artifact in /.github/actions/build-nix

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6.0.0 to 7.0.0.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@b7c566a...bbbca2d)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: 7.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/actions/build-nix/action.yml

@@ -12,7 +12,7 @@ runs:
     shell: bash
   - run: nix run -L --inputs-from . 'nixpkgs-unstable#coreutils' -- --coreutils-prog=cp -RLv ./result '${{ inputs.package }}'
     shell: bash
-  - uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+  - uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
     with:
       name: ${{ inputs.package }}
       path: ${{ inputs.package }}