Bump actions/upload-artifact from 5 to 6

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]>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -169,7 +169,7 @@ jobs:
           echo "name=coverage-data-ci-${{ matrix.python-version }}-${SANITIZED_PATTERN}" >> "$GITHUB_OUTPUT"
 
       - name: Upload coverage data
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ steps.sanitize.outputs.name }}
           path: .coverage.*
@@ -213,7 +213,7 @@ jobs:
           UV_PYTHON: ${{ matrix.python-version }}
 
       - name: Upload coverage data
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-data-skip-tests-${{ matrix.python-version }}
           path: .coverage.*
@@ -296,7 +296,7 @@ jobs:
           coverage report
 
       - name: Upload HTML report if check failed
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: html-report
           path: htmlcov