Bump actions/upload-artifact from 4 to 5

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 5.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -77,15 +77,15 @@ jobs:
 
       - name: Upload coverage data
         if: always() && matrix.session == 'tests' && matrix.os == 'ubuntu-latest'
-        uses: "actions/upload-artifact@v4"
+        uses: "actions/upload-artifact@v5"
         with:
           name: coverage-data-${{ matrix.python }}-${{ matrix.os }}
           path: .coverage.*
           include-hidden-files: true
 
       - name: Upload documentation
         if: matrix.session == 'docs-build'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: docs
           path: docs/_build