chore(deps): bump actions/upload-artifact from 4 to 7

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>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -51,7 +51,7 @@ jobs:
 
       - name: Upload coverage
         if: matrix.python-version == '3.12'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: coverage-report
           path: coverage.xml

.github/workflows/release.yml

@@ -59,7 +59,7 @@ jobs:
           mkdir -p staging
           find build -name "*.a" -exec cp {} staging/ \; 2>/dev/null || true
           tar czf ebuild-${{ steps.version.outputs.version }}-${{ matrix.arch }}.tar.gz -C staging .
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v7
         with:
           name: ebuild-${{ matrix.arch }}
           path: "*.tar.gz"