Bump actions/upload-artifact from 4 to 7 (#504)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  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/build.yml

@@ -44,7 +44,7 @@ jobs:
       - name: Check wheels were produced
         shell: bash
         run: ls wheelhouse/*.whl | wc -l
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v7
         # Only upload when called from publish workflow (has a ref input)
         if: ${{ inputs.ref != '' }}
         with:
@@ -64,7 +64,7 @@ jobs:
           python-version: "3.12"
           enable-cache: true
       - run: uv build --sdist
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v7
         if: ${{ inputs.ref != '' }}
         with:
           name: sdist