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/main.yml

@@ -91,7 +91,7 @@ jobs:
           run: uv run coverage run --context=${{matrix.qt-version}}
 
       - name: Upload coverage artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: coverage-${{ matrix.os }}-${{ matrix.python-version }}-${{ matrix.qt-version }}
           path: .coverage.${{ matrix.os }}-${{ matrix.python-version }}-${{ matrix.qt-version }}
@@ -124,7 +124,7 @@ jobs:
           ANNOTATE_MISSING_LINES: true
 
       - name: Store coverage comment to be posted
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         if: steps.coverage_comment.outputs.COMMENT_FILE_WRITTEN == 'true'
         with:
           name: python-coverage-comment-action