ci(dependabot): bump actions/upload-artifact from 5 to 6 (#718)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/test_and_deploy.yml

@@ -95,7 +95,7 @@ jobs:
           update_existing: true
 
       - name: Upload coverage
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: covreport-${{ matrix.os }}-py${{ matrix.python-version }}-${{ matrix.add-group }}-${{ matrix.resolution }}
           path: ./.coverage*
@@ -128,7 +128,7 @@ jobs:
         run: uv run --no-dev --group pyqt6 coverage run -p -m pytest -v
 
       - name: Upload coverage
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: covreport-mindeps-${{ matrix.os }}-py${{ matrix.python-version }}
           path: ./.coverage*